PS90 - one of those lust things

[HeavyDuty]

I’ve been fascinated by the P90 platform ever since I had a chance to shoot a manufacturer rep’s at a range day decades ago. I know the 5.7 has severe limitations, but at least it’s more available these days - back in the 90s it was unobtainium.

But…

What’s involved in physically converting a 16” PS90 to a SBR? Is it just a barrel swap?

[TGS]

I've thought about doing the same just because it's a really neat gun.

I believe CMMG used to make a 10" barrel for it, not sure if they still do. Most people use a gunsmith to install it.

Or, you could just have a gunsmith cut down the 16" barrel. I'm sure ADCO could take care of it, if you don't have someone local and need to send it out.

So note that unlike the AR-15, the upper is the firearm. So it'll need to be shipped as such.

[HeavyDuty]

I was just searching for info after posting that, and it looks like CMMG is still doing a replacement barrel.

A PS90 SBR would be a true luxury toy, but I still have the wants. Toys have a place, especially now that you can actually afford to feed them.

[fatdog]

Medical limitations that developed the last couple of years have put major caliber rifles and shotguns out of my path for good. I have to limit long guns to things like .22LR, .22WMR and the 5.7 so I dove into the PS90 a while back just to have some long gun with at least pistol caliber terminal ballistics. I have not done the SBR but it is not as simple as rebarreling an AR, certainly people have done it on their own. CMMG is the barrel source.

It is just a barrel swap to get to SBR and I think the flush fit CMMG's take you from 16 down to 10.5 when installed. With the 16" in place it is barely a snitch over the 26" limit.

With the advent of Palmetto's AAC line the ammo has become much more affordable than even pre-pandemic times. Fiocchi who was loading for FN has established their own branded line. The American Eagle FMJ that Fiocchi is loading for Federal in their MO plant is crap for the PS90, I have had many instances of serious bullet setback, it was probably intended for pistols with a straight feed only. PSA's ammo is very accurate and about 50-100 fps hotter than the equivalent Vmax bullets loaded for the FN or Fiocchi branded ammo. It is possible to reload the cases once or twice, but I am not up for that just yet. There is a coating on the cases that will wear off quickly and then you get stuck cases or balky extraction when it is gone. This is a straight blowback action.

There are some ergo challenges for me with the PS90, but with some aftermarket parts (https://hagadefense.com/shop/fn/p90-ps90/) they have all been solved. Getting one of the aftermarket low mount bases (https://fnspecialties.com/ps90-low-profile-red-dot-mount/) is mandatory unless you want to deal with a horrible level of offset and holdovers. There is a fix for the trigger that helps (https://promotedpawn.com/creep-killer-new-version/)but it is still a bullpup, you are not going to get to match level triggers in these.

Other than the problems with American Eagle ammo, mine has been perfectly reliable, and with good ammo it is a 1.5 moa rifle out to 100 yards or so. Lots of fun and everybody at the range wants to give it a try. Recoil is .22WMR level.

If mine were a pure range toy I would SBR it, but I figure that this weak cartridge needs all the barrel it can get for my purposes. I am getting 2450-2500 fps with the SS198LF ammo out of the thing. I think the local coyotes should still consider me a threat.

105157

[HeavyDuty]

Medical limitations that developed the last couple of years have put major caliber rifles and shotguns out of my path for good. I have to limit long guns to things like .22LR, .22WMR and the 5.7 so I dove into the PS90 a while back just to have some long gun with at least pistol caliber terminal ballistics. I have not done the SBR but it is not as simple as rebarreling an AR, certainly people have done it on their own. CMMG is the barrel source.

It is just a barrel swap to get to SBR and I think the flush fit CMMG's take you from 16 down to 10.5 when installed. With the 16" in place it is barely a snitch over the 26" limit.

With the advent of Palmetto's AAC line the ammo has become much more affordable than even pre-pandemic times. Fiocchi who was loading for FN has established their own branded line. The American Eagle FMJ that Fiocchi is loading for Federal in their MO plant is crap for the PS90, I have had many instances of serious bullet setback, it was probably intended for pistols with a straight feed only. PSA's ammo is very accurate and about 50-100 fps hotter than the equivalent Vmax bullets loaded for the FN or Fiocchi branded ammo. It is possible to reload the cases once or twice, but I am not up for that just yet. There is a coating on the cases that will wear off quickly and then you get stuck cases or balky extraction when it is gone. This is a straight blowback action.

There are some ergo challenges for me with the PS90, but with some aftermarket parts (https://hagadefense.com/shop/fn/p90-ps90/) they have all been solved. Getting one of the aftermarket low mount bases (https://fnspecialties.com/ps90-low-profile-red-dot-mount/) is mandatory unless you want to deal with a horrible level of offset and holdovers. There is a fix for the trigger that helps (https://promotedpawn.com/creep-killer-new-version/)but it is still a bullpup, you are not going to get to match level triggers in these.

Other than the problems with American Eagle ammo, mine has been perfectly reliable, and with good ammo it is a 1.5 moa rifle out to 100 yards or so. Lots of fun and everybody at the range wants to give it a try. Recoil is .22WMR level.

If mine were a pure range toy I would SBR it, but I figure that this weak cartridge needs all the barrel it can get for my purposes. I am getting 2450-2500 fps with the SS198LF ammo out of the thing. I think the local coyotes should still consider me a threat.

105157

This isn’t helping one bit. Depending how my neck fusion goes, I may need that upright mount base.

[DocGKR]

Nice adaptation to deal with a significant medical issue.

[awp_101]

fatdog, how's the muzzle blast compared to a 9mm carbine? I'm finding it difficult to find a house carbine my non-shooting wife is comfortable with. Unfortunately a PS90 is out of the question but I might check into the Ruger LC as long as the 5.7 doesn't have 5.56 blast. It's been 15 years since I fired any 5.7 and I flat don't remember.

[fatdog]

fatdog, how's the muzzle blast compared to a 9mm carbine? .

I would say similar, a similar volume of gas. Of course the bullet is traveling twice as fast or more. But I ditched my PCC carbine because the recoil is significantly more than the 5.7.

Ruger 57 is a nice gun, I have it on my list and have put in some trigger time with one that belongs to a close friend. They really did a nice job for what that thing is.

[Half Moon]

fatdog, how's the muzzle blast compared to a 9mm carbine? I'm finding it difficult to find a house carbine my non-shooting wife is comfortable with. Unfortunately a PS90 is out of the question but I might check into the Ruger LC as long as the 5.7 doesn't have 5.56 blast. It's been 15 years since I fired any 5.7 and I flat don't remember.

No experience with 5.7 in a carbine (wife, who is VERY recoil sensitive, loved her FN Five Seven pistol though, till she didn't) but if semi-auto isn't a requirement a .357 Magnum lever action carbine has ridiculously light blast and recoil if a 5.7 carbine doesn't pan out. I intermittently look at the Ruger .357 Magnum bolt actions but can't get past the current going price...

[fatdog]

... a .357 Magnum lever action carbine has ridiculously light blast and recoil

Yes, I was in CAS for many years and kept one of those. With .38 Special 158gr +P LSWCHP it is manageable in terms of the recoil. The ergos are a little tougher for me, nothing can come in contact with my jaw, I still have to shoot these long guns in an exaggerated outboard position and the Winchester 1892 is not as comfortable.

My cheek weld was replaced with what you can probably say is an eye socket weld. What Haga Defense did for the PS90 with his cheek riser plus a little bit of enclosed foam rubber padding turns out to work very well for me. Some day I am going to experiment with a riser on the '92 stock and I think I can make that work.

[HeavyDuty]

Question that I haven’t answered searching, at least not yet. The rail section here is removable, correct? What are you left with when you remove it?

I’m curious because I’m probably going to have substantial neck flexibility limitations following this surgery (four level cervical vertebrae fusion.) If if were to get one of these, sighting plane height might become an issue.

105200

Edit - it looks like you have a gaping hole? I looked at fatdog’s link again and saw the RDS adapter he used.

[PNWTO]

I mentioned it in another thread but my only “WTF was I thinking” moment in firearm purchasing was passing up a NIN PS90 and FiveseveN combo for $1200. Would have been a pretty good fit for life today.

That was also the coolest LGS of all time, in Coeur d'Alene, and they’ve closed since; so double sad.

[fatdog]

Question that I haven’t answered searching, at least not yet. The rail section here is removable, correct? What are you left with when you remove it?.

Yes two screws from the top hold it in place. You end up with a big gutter, the low mounts go right in the same place.

It is quite possible that you could use a low mount and not get the cheek riser in the rear and still have plenty of height above bore to keep your head up straight.

That factory pic rail is simply too high, I cannot remember the dimensions but its something like 4" above the bore. The only time I used it was to mount an LPVO to see what I could actually do with the rifle at 100 and 200 yards. But in terms of finding a zero distance and remembering holdovers for a simple red dot, it was a no go for me.

I think you actually have to go handle one to understand the ergonomics of the thing. I have owned an AUG, a Tavor 21, and one of the Bushmaster Edenpine bullpups and none of them had ergos I found very comparable to the PS90. I believe it is just a bit different from the others in terms of how it mounts.

The more I have shot mine, the more I have come to like it and become comfortable with it, as you would expect.

[Joe in PNG]

I too share an irrational desire for a PS90.

[HeavyDuty]

I’m glad to hear I’m not alone!

[HeavyDuty]

Yes two screws from the top hold it in place. You end up with a big gutter, the low mounts go right in the same place.

It is quite possible that you could use a low mount and not get the cheek riser in the rear and still have plenty of height above bore to keep your head up straight.

That factory pic rail is simply too high, I cannot remember the dimensions but its something like 4" above the bore. The only time I used it was to mount an LPVO to see what I could actually do with the rifle at 100 and 200 yards. But in terms of finding a zero distance and remembering holdovers for a simple red dot, it was a no go for me.

I think you actually have to go handle one to understand the ergonomics of the thing. I have owned an AUG, a Tavor 21, and one of the Bushmaster Edenpine bullpups and none of them had ergos I found very comparable to the PS90. I believe it is just a bit different from the others in terms of how it mounts.

The more I have shot mine, the more I have come to like it and become comfortable with it, as you would expect.

I’m guessing the original optic these had is a dead issue at this point? I’m not seeing them anywhere.

[HeavyDuty]

Man, I’m finding there is a whole ecosystem out there for these things. Example - an ACRO mount: https://dmachineri.com/products/ps90-fixed-mount-aimpoint-acro

My first thought is that an ACRO or MPS would be ideal for a 1x RDS on one of these.

[Elwin]

Man, even with the 16” barrel that looks like a very handy long gun. Rail also looks functional while mitigating that long barrel awkward look non-SBR subguns are plagued by. I think the extra velocity for a velocity-dependent round also makes a ton of sense.

I remember an InRange video where Karl mentioned that an older woman of very small stature was a regular at their two gun matches and used a PS90 instead of an AR because it was just that much easier for her frame to manage. It seems like a very reasonable AR-lite option for those who have one physical limitation or another.

[HeavyDuty]

I love researching new things.

It looks like the CMMG barrel is the way to go when SBRing these. The muzzle end is confusing me a little, though - I think it’s threaded M12x1 LH and you can put on a P90 style compensator or a 1/2x28 adapter, both which are made by CMMG. Dead Air also makes a M12x1 LH adapter so you can use a Mask can. It looks like some people stick an A2 type compensator on the thread adapter or just a thread protector when they aren’t running suppressed.

Also, HB Industries is offering a new range of optic adapters in addition to the ones fatdog and I linked above. This might be a great application for a PA SLx prism.

I’m a little worried I’ve moved to the problem solving stage of research. This may not bode well.

[fatdog]

I’m guessing the original optic these had is a dead issue at this point? I’m not seeing them anywhere.

Yes the "secret service" optic has been out of production for years, they turn up at scalper/collector prices from time to time. I have shot one, I did not like it at all, almost no field of view in the thing and not as distinct as other red dots. My rifle as pictured has an Aimpoint Patrol version and I am pretty happy with that choice, there is also a good low mount available for the Aimpoint 30mm optics.

One thing most people don't know about the base factory rifle, it is not a threaded barrel, the flash hider ports are in the external barrel sleeve around the actual factory barrel, so changing muzzle attachments requires a threaded barrel and losing the barrel sleeve, but you have to have a long enough muzzle device to get you back to 26+ inches if you are not SBR's the thing. The barrel sleeve extends a couple of inches beyond the actuall muzzle and in addition to providing the flash hiding ports, gets the thing past the 26" legal requirement.

The barrel in this thing actually recoils a tiny bit when it cycles and moves rearward inside that barrel sleeve, so the sleeve is not a really tight fit which freaks some people out and cause some "my barrel is loose" reactions... but it is a solid system that works quite well.

[CleverNickname]

I too share an irrational desire for a PS90.

Ditto. But if I got one I'd want to SBR it. And if I SBR'ed it I'd want to SBR one of these billet receivers (https://fn57sale.com/product/effen-90-ps90-receiver/) instead of the factory cast one. But that means I'd either have to buy a whole PS90 and then pay extra for the aftermarket receiver, or try to buy all the non-receiver parts piecemeal to build up the receiver. And of course then I'd have to get a silencer for it too. Also I've basically run out of room in my safe for long guns, I don't need another caliber to buy, and I already have an SBR'ed Rattler that makes a much better PDW.

It's all too much work, honestly.

[CSW]

Medical limitations that developed the last couple of years have put major caliber rifles and shotguns out of my path for good. I have to limit long guns to things like .22LR, .22WMR and the 5.7 so I dove into the PS90 a while back just to have some long gun with at least pistol caliber terminal ballistics. I have not done the SBR but it is not as simple as rebarreling an AR, certainly people have done it on their own. CMMG is the barrel source.

It is just a barrel swap to get to SBR and I think the flush fit CMMG's take you from 16 down to 10.5 when installed. With the 16" in place it is barely a snitch over the 26" limit.

With the advent of Palmetto's AAC line the ammo has become much more affordable than even pre-pandemic times. Fiocchi who was loading for FN has established their own branded line. The American Eagle FMJ that Fiocchi is loading for Federal in their MO plant is crap for the PS90, I have had many instances of serious bullet setback, it was probably intended for pistols with a straight feed only. PSA's ammo is very accurate and about 50-100 fps hotter than the equivalent Vmax bullets loaded for the FN or Fiocchi branded ammo. It is possible to reload the cases once or twice, but I am not up for that just yet. There is a coating on the cases that will wear off quickly and then you get stuck cases or balky extraction when it is gone. This is a straight blowback action.

There are some ergo challenges for me with the PS90, but with some aftermarket parts (https://hagadefense.com/shop/fn/p90-ps90/) they have all been solved. Getting one of the aftermarket low mount bases (https://fnspecialties.com/ps90-low-profile-red-dot-mount/) is mandatory unless you want to deal with a horrible level of offset and holdovers. There is a fix for the trigger that helps (https://promotedpawn.com/creep-killer-new-version/)but it is still a bullpup, you are not going to get to match level triggers in these.

Other than the problems with American Eagle ammo, mine has been perfectly reliable, and with good ammo it is a 1.5 moa rifle out to 100 yards or so. Lots of fun and everybody at the range wants to give it a try. Recoil is .22WMR level.

If mine were a pure range toy I would SBR it, but I figure that this weak cartridge needs all the barrel it can get for my purposes. I am getting 2450-2500 fps with the SS198LF ammo out of the thing. I think the local coyotes should still consider me a threat.

105157


That thing is just damn sexy.

[HeavyDuty]

I am such a slut. Ordered.

Now, what optic?

[HeavyDuty]

fatdog, is this the PSA ammunition you mentioned upthread?

105254

[CSW]

I am such a slut. Ordered.

Now, what optic?

Accro?

Bigger?

Was out with my FN15 this morning, it wears the MRO.
I'm diggin' that optic.
I don't know much about these weapons, but the rail looks like it screams for a low mount optic.

[HeavyDuty]

Accro?

Bigger?

Was out with my FN15 this morning, it wears the MRO.
I'm diggin' that optic.
I don't know much about these weapons, but the rail looks like it screams for a low mount optic.

Not sure, I’ll want to shoot it in as is to be sure it doesn’t need immediate warranty work. The high rail has to go. But after that, I have a couple of options I can do with what I have on hand:

* Romeo4T
* Steiner MPS
* Aimpoint M2

I like how low a R4T or T1 would mount in this one:

https://dmachineri.com/collections/scope-mounts/products/ps-90-aimpoint-t-1-vortex-sparc-ll-romeo-5?variant=23497745334336

[CSW]

I dig that new Steiner optic. 🥒

[HeavyDuty]

I dig that new Steiner optic. 🥒

Which one?

[fatdog]

fatdog, is this the PSA ammunition you mentioned upthread?

105254

Yes, as with most PSA things it goes in and out of stock but on Friday they had the Vmax for 60 cents and the fmj for 50 cents. Both have run fine for me and the AAC Vmax is hotter and more accurate than both the Fiocchi or FN labeled loading of the same bullet.

[CSW]

Which one?

I was referring to the new pistol sight, which I'm sure that you could mount.....

But then there's this ;

https://www.steiner-optics.com/battle-sights/drs1x

[HeavyDuty]

Yes, as with most PSA things it goes in and out of stock but on Friday they had the Vmax for 60 cents and the fmj for 50 cents. Both have run fine for me and the AAC Vmax is hotter and more accurate than both the Fiocchi or FN labeled loading of the same bullet.

I signed up for the stock notifications. Thank you!

[HeavyDuty]

I was referring to the new pistol sight, which I'm sure that you could mount.....

But then there's this ;

https://www.steiner-optics.com/battle-sights/drs1x

I remember seeing those - my only issue with one on a PS90 is that it would sit really high.

[fatdog]

I signed up for the stock notifications.
I don't even think those work at PSA...better to check every afternoon...that is what it took for me to get some, none of the out of stock notifications from those guys has triggered for me on those high demand items...

[HeavyDuty]

Another optic option that is popular on the PS90 Reddit. The OEM sight manufacturer in the UK is offering an updated battery powered 1x prism sight. Pricing isn’t bad, and the dollar is strong right now. This one is tempting - the gun will be a toy, so having something close to the original optic is appealing. I’m searching for reviews.

https://www.ringsights.com/products/mc-10-80-p90-sight/

https://www.kingsviewoptical.com/products/electronic-black-ringsight/

[HeavyDuty]

Reviews make the Ring Sight sound pretty primitive. I’ll keep an eye out for a used one, but I would probably do better to put something else on there.

I’ll use one of my Romeo4Ts for now, and maybe order a Duty RDS (the cheap T sight) at some later point - they use the same Design Machine mount.

[awp_101]

Midsouth has Fiocchi on sale (https://www.midsouthshooterssupply.com/dept/ammunition/pistol/5-point-7x28mm?instock=true&trk_msg=9UU26MGTH2KKP5GQN5G9G7LEL8&trk_contact=41CRTG1JD793JGCNVLU3G0P6B4&trk_sid=D56D2HCU9DISRQQMVUJCDR8JH0&trk_link=EI62AQLL9BN4JD58E51715SFG8&utm_source=listrak&utm_medium=email&utm_term=turn+on+images+to+shop+fiocchi+5.7x28mm+a mmo&utm_campaign=New+Fiocchi+5.7x28mm+Bulk+Ammo+In+Sto ck!).

Not sure how good the price is, just doing my bit to help enable.😁

[HeavyDuty]

62 grain subs? Interesting.

[CleverNickname]

62 grain subs? Interesting.
If the question is "How do we get near-.22LR performance, but spend a LOT of money per round doing so?" then that seems like a good answer.

[HeavyDuty]

If the question is "How do we get near-.22LR performance, but spend a LOT of money per round doing so?" then that seems like a good answer.

Or if the question is “how do I reduce suppressed sound signature as much as possible for critter popping” it might be a good answer, too.

[The Rat]

Or if the question is “how do I reduce suppressed sound signature as much as possible for critter popping” it might be a good answer, too.

You want maximum efficiency in discreet critter popping for chicken coop counterassault patrols? I submit to you for your inspection this contraption:

https://i.imgur.com/oLUKkOv.jpeg

CMMG 4.5" barrel keeps any high velocity rounds subsonic, and the Silencerco Spectre II means no first round pop. Aimpoint M4 plus 3x magnifier gives good daytime targeting capabilities even when the threat is high up in a tree. Surefire Vampire light gives a good shine off the eyes of any critters when viewed through nods, and the CQBL-1 being parallel over the bore means no offset to deal with for close range targets.

It looks silly, but it has put down a lot of critters, and every bit of kit on that has been used for that purpose.

Best ammunition I've found is CCI segmented subsonic hollow point. (Regular subsonic, not the 'quiet' variety.) I've had more one shot drops with that than anything else. As long as you put it in their head, it's good. Other brand hollow points haven't been nearly as efficient.

This is an older pic, it has since been upgraded with a Sig collapsing/folding stock, since I don't need the buffer tube to cycle.

[HeavyDuty]

fatdog - what is your slinging arrangement? I’m seeing the Urban ERT sling out there, but it looks like cosplay for a bondage convention.

https://www.urbanertslings.com/fn-p90-ps90-urban-sentry-hybrid-sling-complete-kit/

[fatdog]

fatdog - what is your slinging arrangement? I’m seeing the Urban ERT sling out there, but it looks like cosplay for a bondage convention.

https://www.urbanertslings.com/fn-p90-ps90-urban-sentry-hybrid-sling-complete-kit/

Ken, I had one of those and found the snap together links got in the way of my grip, both front and rear, gave it to a guy at my gun club who has a PS90. It worked but I just found it was in my way more than it was helping.

The sling in the picture of my rifle back on page 1 is a simple Magpul, I have also been known to hook up a Proctor sling.

The rear QD attachment point is provided by the Haga cheek riser in my case, I have a QD point both on the pic rail at the top of the receiver and another M-Lok QD attachment point on the Haga forend. If I were going to sling it over my back and move with it I would use the forward QD socket but slung in front of me in a ready position I most often choose the QD socket on the side of the receiver pic rail.

if you want a QD attachment point on the front of the body of the gun, there are some (https://promotedpawn.com/for-ps90/cup-for-qd-sling/) that replace the frame screws (theoretically could go in any of them) and before the Haga forend I had one all the way out in the last screw in the front of the body. That almost worked fine but since I use the KM Aerospace charging handle (https://www.kmaerospace.com/PS90handler.shtml), it was in the way for me and I took it off.

Bottom line for me was there are lots of options but it took getting my ass in the grass with the rifle to figure out what was really going to be the best ergonomically for me, it was trial and try again.

105490

[HeavyDuty]

Bottom line for me was there are lots of options but it took getting my ass in the grass with the rifle to figure out what was really going to be the best ergonomically for me, it was trial and try again.


This is the key. I was pretty sure the buckles would drive me crazy, but I’m also not sure of QD cup positioning. I’ll probably hold off until after it’s SBRed and then start playing with QD cups - on ARs I traditionally run them just forward of the barrel nut/Delta ring and on the end plate with a 2 to 1 convertible sling, but the balance of a PS90 is going to be totally different. Ass in the grass indeed!

[HeavyDuty]

Things are coming together, but I won’t be able to shoot it for a few months until I’m out of the neck brace.

Ammunition stocked, temporary RDS mounted (a Romeo5 that will get used on a 10/22.) I’m still looking at slinging options but that’s not urgent. The trigger is fine as is so no work needed there, and the stock cocking handles are fine for me.

This really won’t have any practical use. I love the first world.

[HeavyDuty]

Ditto. But if I got one I'd want to SBR it. And if I SBR'ed it I'd want to SBR one of these billet receivers (https://fn57sale.com/product/effen-90-ps90-receiver/) instead of the factory cast one. But that means I'd either have to buy a whole PS90 and then pay extra for the aftermarket receiver, or try to buy all the non-receiver parts piecemeal to build up the receiver. And of course then I'd have to get a silencer for it too. Also I've basically run out of room in my safe for long guns, I don't need another caliber to buy, and I already have an SBR'ed Rattler that makes a much better PDW.

It's all too much work, honestly.

Not to enable or anything, but FN Specialties has that receiver on sale right now.

[HeavyDuty]

I just got the alert that Aimpoint had the Duty RDS back in stock, so that’s ordered. I’m tempted to start the Form 1 process now while I’m laid up.

[CSW]

Where are the pictures of this ultra cool kid blaster?

[HeavyDuty]

Hard to do too much right now with me laid up. Let me see what I can do.

[CSW]

Hard to do too much right now with me laid up. Let me see what I can do.

Heal up first dude!

[awp_101]

Hard to do too much right now with me laid up. Let me see what I can do.


Heal up first dude!

Screw that, we want pics!😈

[HeavyDuty]

Heal up first dude!


Screw that, we want pics!😈

Lol. Ok, how about this - the Duty RDS will be here in a few days. After it’s here and installed I’ll take a low effort pic. Goodnuff?

[awp_101]

Lol. Ok, how about this - the Duty RDS will be here in a few days. After it’s here and installed I’ll take a low effort pic. Goodnuff?

Nah, I'm just chain yanking!;) Take the time you need and don't rush it!

[HeavyDuty]

fatdog, have you had any magazine issues using the factory rollers?

[fatdog]

fatdog, have you had any magazine issues using the factory rollers?

None. If you take them out and compare them to the high polish very smooth polymer versions Mancave does, or the aluminums being sold by Midwest Gun Works, you will find the factory versions look very rough by comparison. But in the end I think they are fine. When you study the real role of the rollers, they are only really critical in the first two rounds in which are also the last two rounds out, otherwise they are acting just as any other cartridge in the magazine the rest of the time. I did replacements on some of my mags but do not intend to pursue 100% replacement with the smoother variants.

The other magazines available, Promag are not something I would even be willing to try, because "Promag" = "lets see if we can make a reliable platform jam" to me, no matter what platform.

[HeavyDuty]

Thanks! I decided ProMag wasn’t worth the risk, if you shop hard you can find the FN 50s for $34 with no trouble. I may order some rollers to see if they are worth it for me.

[HeavyDuty]

Now that the neck brace is off, I want to get this out and maidened soon - my eForm1 shouldn’t be too much longer.

[HeavyDuty]

It took a month, but I finally got the PS90 to the range. What a hoot!

[breakingtime91]

It took a month, but I finally got the PS90 to the range. What a hoot!

Pics? I'm going to grips with the fact that my wife will never be an AR15 operator and something smaller and lighter may be in order.

[HeavyDuty]

Here’s a quick one - I decided I didn’t like the slinging system I picked up, so I’m probably going to add QD points. I may add oversize cocking lever knobs, too - at least one. And I’m waiting for the eForm 1 to process because this barrel is entirely too long.

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[HeavyDuty]

Pics? I'm going to grips with the fact that my wife will never be an AR15 operator and something smaller and lighter may be in order.

Try and get her hands on one first - cocking takes a bit of effort.

[breakingtime91]

Try and get her hands on one first - cocking takes a bit of effort.

Roger. Ya that's the issue with all of this. She can hold and shoot an AR but will she ever learn to reload, clear malfunctions, etc? Probably better off teaching her to use a pistol and if she gets interested get her a rifle she actually wants

[HeavyDuty]

Roger. Ya that's the issue with all of this. She can hold and shoot an AR but will she ever learn to reload, clear malfunctions, etc? Probably better off teaching her to use a pistol and if she gets interested get her a rifle she actually wants

That would be my thought. I ended up with a Beretta CX4 for SWMBO, she can manipulate it well. But she has also taken a liking to my Scorpion, despite her usual disdain for AR style safeties…

[fatdog]

This cocking handle (https://www.kmaerospace.com/PS90handler.shtml)made a huge difference for me, I only have it on the left hand side of my rifle.

[JRB]

Roger. Ya that's the issue with all of this. She can hold and shoot an AR but will she ever learn to reload, clear malfunctions, etc? Probably better off teaching her to use a pistol and if she gets interested get her a rifle she actually wants

An FN Fiveseven with a matching CMMG AR in 5.7 that takes the FN magazines has some appeal for a situation like that.

PS90's have some really unusual handling and manual-of-arms characteristics that take some dedication to master.

[HeavyDuty]

This cocking handle (https://www.kmaerospace.com/PS90handler.shtml)made a huge difference for me, I only have it on the left hand side of my rifle.

I like that better than the wider round ones - ordered. Thank you!

[HeavyDuty]

Annnnd… Ms. Ripley came through this morning but it won’t let me upload a pic of my newly SBRed PS90.

[CleverNickname]

Annnnd… Ms. Ripley came through this morning but it won’t let me upload a pic of my newly SBRed PS90.
Just upload a pic to Imgur or something, then when you choose the "Attach Image" icon, use the "From URL" tab, give it the URL to the remote file and uncheck the "Retrieve remote file and reference locally" checkbox.

[HeavyDuty]

Just upload a pic to Imgur or something, then when you choose the "Attach Image" icon, use the "From URL" tab, give it the URL to the remote file and uncheck the "Retrieve remote file and reference locally" checkbox.

Way too much effort for a (hopefully) temporary issue. I was able to upload the long Tom PS90 pic yesterday which was a shock.

[HeavyDuty]

Got the K&M folding cocking handles installed, they make a big difference in handling.

I also got one of their trigger springs which reduced the pull from nearly 8# to a more manageable 5.5#. I’ll need to prove reliability, of course.

I’m working on slinging hardware next, I think I’m done after that.

[El Cid]

Here is one for $1799 with a Vortex red dot.

Of greater interest to me... the stock is FDE/Brown. It doesn't appear to be a coating. And the section about the rebate mentions a Tungsten color option...

https://palmettostatearmory.com/fn-ps90-5-7x28-16-50rd-rifle-w-vortex-viper-flat-dark-earth-3848950470.html

[HeavyDuty]

I never did post pics of what is likely the final configuration. All that I see possibly changing is the muzzle device for a suppressor mount, but to be honest the tiny size is what appeals and I really don’t need to quiet it.

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[TGS]

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How are you making use of the light without a tape switch?

[HeavyDuty]

How are you making use of the light without a tape switch?

Ain’t elegant, but it works for on/off. This is a very limited purpose toy, if I decide it will become a primary house gun (doubtful) I’ll look at other options.

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[TGS]

Ain’t elegant, but it works for on/off. This is a very limited purpose toy, if I decide it will become a primary house gun (doubtful) I’ll look at other options.

Got it.

If you didn't want to mess around with a tape switch, an offset mount might work well, too. I think Surefires come on cantilevered mounts as standard, now.

[Doc_Glock]

117727117726

The PS 90 is an exceedingly cool and reliable rifle that I just don't use at all any more. I would be happy to pass it along if this interests any of you. It was a project I worked quite hard on. Then haven't shot for years.

This is sort of a for sale post, but you can also use it to see what a money pit these can be and also maybe for ideas for your own build.


Here is what I have along with current retail prices:



FN PS 90 with barrel machined to 10.5 inches Tax stamped as an SBR: $1500

Gemtech SAR 5.7 Screw on silencer also tax stamped NFA Item: $600

Aimpoint micro H1: $600

Streamlight TLR-1 older: $100

QD sling mounts installed


Rifle with ad ons total: $2800



10 extra magazines (8 are new in box): $40 X 10= $400
800 FNH SS197SR ammunition @ 0.75 each: $600

1800 SS198LF (tel:1800 SS198LF) ammunition @0.95 each: $1710

1175 Federal American Eagle 40gr ammunition @ 0.55 each: $646

Ammo and Mag total: $3356



Retail total: $6156 I did not include the tax stamps in the total.

-It has fired 775 rounds and zeroed for 100 yards.

- I have original box.

Selling it is a PITA due to the tax stamps involved. I suppose I would be better just keeping the suppressor for another application and selling the rest of the accessories. Or maybe just have a shoot party with some friends and shoot the crap out of it:)

[CleverNickname]

I keep wanting a P90, but then I remember the cartridge is lame and underpowered, yet also expensive. Someone needs to make a P90-style bullpup in 9mm with the magazine over the action, except use a helical magazine like the Calico Liberty.

[zaitcev]

I like the idea theoretically, but unfortunately this thing is absolutely tiny. I swear I had handguns that were almost as big (sorry that was a joke). Look at Ken's photo where he reaches with his thumb to the light on top. Because it's so small, I have to crouch uncomfortably over and around it. My neck is too long for a P90. *sad trombone sound*