308 semi s

[Evil_Ed]

I have a SCAR 17 and am curious about your comments about suppressing. I changed the muzzle device and have a Sons of Liberty 7.62 NOX and use a Dead Air Sandman. It has the two position gas regulator. If I switch it to the suppressed setting the gun will not cycle unsuppressed. I figured it was made to run suppressed?

What ammo are you shooting? Mine worked just fine in both positions with the random NATO surplus ammo I was feeding it...I swapped the factory gas jet (1.45mm) to a PMM 1.4mm and it no longer cycled on the "not normal" setting. The manual (at least mine) never actually explains what the gas settings are, just that the 12-oclock position of the gas regulator is the correct position for normal firing.

I could probably safely put a 1.35mm gas jet in, but I wanted to make sure there was a decent buffer for the operating envelope of the thing.

If you check fnforum.net you'll see a bunch of people who either didn't adjust their gas jetting or put on super high blowback cans on their guns, wound up beating it up/cracking the rear of the receiver, and FN wouldn't warranty the guns because they weren't being fired with FN approved suppressors...all that with the gun in the "suppressed" setting.

I don't shoot mine with a can all that much, but when I do, I'm really, really cautious with it.

[call_me_ski]

Colt is bringing back the CM5 is 13in and 16in varieties. Good option if you want a 308 rifle.

[JRB]

Original HK spec G3's and HK91's have a buffer assembly intended to keep the weapon intact when firing rifle grenades. Meaning it's stiff as hell.

A few different guys like Bill Springfield and a few others have figured out how to make the buffer reduce felt recoil substantially, but ostensibly at the expense of being bomb-proof with things like rifle grenades and proof-load ammo.
Typically these changes include a longer pushrod so the bolt carrier contacts the buffer sooner and thereby slows the bolt carrier for a lot longer in the firing cycle, and that's paired with a different spring that doesn't have a travel limiter included into it. I've used the Bill Springfield buffer kits to good effect in a factory HK91 and a couple of clones, including a PTR.

As I understand it, the buffers found in newer PTR91's include these changes from the factory.

[JTMcC]

Original HK spec G3's and HK91's have a buffer assembly intended to keep the weapon intact when firing rifle grenades. Meaning it's stiff as hell.

A few different guys like Bill Springfield and a few others have figured out how to make the buffer reduce felt recoil substantially, but ostensibly at the expense of being bomb-proof with things like rifle grenades and proof-load ammo.
Typically these changes include a longer pushrod so the bolt carrier contacts the buffer sooner and thereby slows the bolt carrier for a lot longer in the firing cycle, and that's paired with a different spring that doesn't have a travel limiter included into it. I've used the Bill Springfield buffer kits to good effect in a factory HK91 and a couple of clones, including a PTR.

As I understand it, the buffers found in newer PTR91's include these changes from the factory.

Thank you. That, is a very interesting bit of info and explains why some people consider that gun to recoil more, and some people don't.

[Evil_Ed]

Thank you. That, is a very interesting bit of info and explains why some people consider that gun to recoil more, and some people don't.

Having the right locking piece also plays a huge role. There's at least 30 different locking pieces that could be used...something like 8 or 10 of them for G3/G3k/HK91/other 308 models could be swapped in and used depending on the ammo, barrel length, so on so forth.

https://www.geekgunman.com/hklp.htm - HK locking piece table

[rhino on INGO]

Original HK spec G3's and HK91's have a buffer assembly intended to keep the weapon intact when firing rifle grenades. Meaning it's stiff as hell.

A few different guys like Bill Springfield and a few others have figured out how to make the buffer reduce felt recoil substantially, but ostensibly at the expense of being bomb-proof with things like rifle grenades and proof-load ammo.
Typically these changes include a longer pushrod so the bolt carrier contacts the buffer sooner and thereby slows the bolt carrier for a lot longer in the firing cycle, and that's paired with a different spring that doesn't have a travel limiter included into it. I've used the Bill Springfield buffer kits to good effect in a factory HK91 and a couple of clones, including a PTR.

As I understand it, the buffers found in newer PTR91's include these changes from the factory.

Interesting! That never would have occurred to me, so thanks for sharing that information.

[JTMcC]

Having the right locking piece also plays a huge role. There's at least 30 different locking pieces that could be used...something like 8 or 10 of them for G3/G3k/HK91/other 308 models could be swapped in and used depending on the ammo, barrel length, so on so forth.

https://www.geekgunman.com/hklp.htm - HK locking piece table

Thanks for that too.

[Joe in PNG]

You buncha enabling SOB's... now I'm starting to want a PTR, and some Sphur stocks to go on it.

[Odin Bravo One]

https://pistol-forum.com/showthread....-17-discussion


I don’t know how much interest there might be but there are some older observations regarding one user’s journey through .30 caliber battle and precision rifles in this thread.