Mounting Holosun EPS Carry on a SIG P365 series - lets consolidate tech data

[RAM Engineer]

Since this is a pretty popular combo, AND because I just bought both, I had some questions before I proceeded to mount the optic. Not easy to find the straight info on here. SO, why don't we consolidate that info here?

1. What size bit to remove the factory P365 optic cover plate? - Torx T10
2. Optic riser plate or no riser plate for EPS Carry (using stock sights)?
3. What size screw for optic with riser plate? Without riser plate? - w/ Plate: , no Plate: M3 x 10MM FH
4. What torque for optic mount screws?
5. Recommended thread-locking compound? - Loctite 242 (blue)
6. What size screw for battery compartment?
7. Preferred/Recommended 1620 batteries?

[centex]

Since this is a pretty popular combo, AND because I just bought both, I had some questions before I proceeded to mount the optic. Not easy to find the straight info on here. SO, why don't we consolidate that info here?

1. What size bit to remove the factory P365 optic cover plate? - Torx T10
2. Optic riser plate or no riser plate for EPS Carry (using stock sights)?
3. What size screw for optic with riser plate? Without riser plate? - w/ Plate: , no Plate: M3 x 10MM FH
4. What torque for optic mount screws?
5. Recommended thread-locking compound? - Loctite 242 (blue)
6. What size screw for battery compartment?
7. Preferred/Recommended 1620 batteries?


Timely for me as I have a fresh 365x and an EPS Carry that need to be mated. Below was my plan, based on several 365xl to 507k installs:

1 - Torx T10
2 - no plate
3 - M3 x 0.5mm x 8mm flat head screws
4 - 15 in lbs (I error on a touch less than more using my analog Wheeler Fat Wrench)
5 - Loctite 248 (the blue "glue stick" Loctite)
6 - no answer, but interested to find out. I haven't yet had to replace one. Screw gets a bit of 248 as well for me.
7 - Duracell


Clean all surfaces with a degreaser prior to install, to include the screws before Loctite, and let cure for 24+ hours before use.


Will wait for more responses to this thread in case I'm not as squared away as I think before moving forward.

[RAM Engineer]

2 - no plate
3 - M3 x 0.5mm x 8mm flat head screws


Interesting about your choice of 8mm for a no-plate install. I think I've only ever heard of 10mm for no-plate, and 12mm for with plate.

[centex]

Interesting about your choice of 8mm for a no-plate install. I think I've only ever heard of 10mm for no-plate, and 12mm for with plate.

The 8mm length was based on some threads here and on the GenPop Sig forum. I have boxes of 6mm, 8mm, and 10mm from McMaster-Carr so if the hive mind here says 10mm I'm covered.

[RAM Engineer]

Basically what we need is a SIG P365 version of the stickied thread "Glock MOS RDS install thread (What has worked for me)", with the drastic increase in popularity of the P365 series guns.

[RJ]

Interesting about your choice of 8mm for a no-plate install. I think I've only ever heard of 10mm for no-plate, and 12mm for with plate.

It may be an old (captive rear sight) or new (dovetail rear sight) style slide thing?

I used 10mm McM-C screws for my old style P365XL slide, without a plate, EPS Carry install last year.

[RAM Engineer]

GJM and G19Fan you guys have lots of these guns and optics. Any info you can share?

[RJ]

1 - Torx T10
2 - no plate
3 - M3 x 0.5mm x 10mm flat head screws from McMaster-Carr, Part no. https://www.mcmaster.com/catalog/130/3479/94414A714
4 - 15 in lbs, Wheeler FAT wrench
5 - Blue threadlocker
6 - M2.5x0.45x5 mm https://www.mcmaster.com/catalog/91698A241 (per Clusterfrack)
7 - Duracell CR 1620 https://a.co/d/byQkJNg
8 - Special note: Above is for an old style (captive rear sight) P365XL slide

116057

[GJM]

Some people have reported issues with the supplied Holosun EPS Carry screws being a smidge long on some 365 slides. I believe those were the older slides that had the rear sight integral to the cover plate you remove to install the optic. Clusterfrack figured out the McMaster screws of the proper length, and I show those as M3 0.5 x 10mm Torx Plus flat head, part 384-0310-01-0100.

Biggest issue I have with the EPS Carry is the + and - buttons are so close, that if you grab the optic to work the slide, you can inadvertently turn the optic off. Putting it in lock out mode prevents that, at the cost of making dot intensity adjustments slower. I don't use lock out mode, but don't grab the optic to work the slide.

[RAM Engineer]

Clusterfrack figured out the McMaster screws of the proper length, and I show those as M3 0.5 x 10mm Torx Plus flat head, part 384-0310-01-0100.

That is for the current, separate sight and plate setup?

[GJM]

That is for the current, separate sight and plate setup?

My understanding is that is the right screw for both installations.

[centex]

Just got back from installing my EPS Carry on a P635 slide (new style plate that doesn't contain the backup sights). After dry fitting, it was clear that the 10mm screw would be just fine so that's what I used. I do think that the 8mm would have worked as well, as some folks here have suggested in the past. Let the curing period begin! Many thanks to the folks on this thread who pointed me in the right direction.

As an aside, I also had an old style P635XL slide (plate contains the backup sights) and a 507k that just came back from the Holosun repair shop (+ button stopped working). That optic/slide combo also needed the 10mm length M3 x 0.5mm screw.

[RAM Engineer]

Has anyone used the EPS Carry riser plate that comes with the optic for their P365 install? It seems like the consensus is most people do NOT use it, but I was wondering if anyone had experience the other way.

[G19Fan]

Has anyone used the EPS Carry riser plate that comes with the optic for their P365 install? It seems like the consensus is most people do NOT use it, but I was wondering if anyone had experience the other way.

I use them on 9+ eps carry and 365 combos

Started using them as I had a eps carry come loose..no issues after plates (including 30k+ rounds on a gun)

[RAM Engineer]

I use them on 9+ eps carry and 365 combos

Started using them as I had a eps carry come loose..no issues after plates (including 30k+ rounds on a gun)

Using stock irons or higher irons? How’s the iron sight picture through the riser-mounted EPSc?

[GJM]

I use them on 9+ eps carry and 365 combos

Started using them as I had a eps carry come loose..no issues after plates (including 30k+ rounds on a gun)

Usually a plate is another possible failure point, what is your theory as to why the plates are working better for you?

[G19Fan]

Using stock irons or higher irons? How’s the iron sight picture through the riser-mounted EPSc?

Stock irons lower 1/5 cowitness. Perfect.

I do prefer old style slides which is same with holosun rear nubs

[G19Fan]

Usually a plate is another possible failure point, what is your theory as to why the plates are working better for you?

None at all except 2 non plate eps carry came loose in under 1k rounds

[SoCalDep]

I’ve mounted a lot of EPS Carry optics on 365 Macros and others have mounted a lot more based on my instructions.

I first used 10mm screws (since that’s what we used for the 507K footprint) but the EPS Carry has a shorter deck height. It was pointed out to me here (apparently the search function isn’t super easy to find info) that 8mm screws were more appropriate so I pulled the McMaster screws from my Macro and indeed the first couple threads were getting smooshed. I ordered 8mm screws and checked them. Good thread engagement and no smooshing.

So here are my thoughts-

10mm screws work. I think 8mm is better from a perspective of minimizing the torsional forces cranking the 10mm past where it’s really supposed to go.

I wouldn’t/ won’t use the plate. There’s no need when the optic is mounted correctly. If it comes loose there’s a bigger issue than what would be fixed with a plate or the mounting was done wrong.

[WobblyPossum]

I’ve mounted a lot of EPS Carry optics on 365 Macros and others have mounted a lot more based on my instructions.

I first used 10mm screws (since that’s what we used for the 507K footprint) but the EPS Carry has a shorter deck height. It was pointed out to me here (apparently the search function isn’t super easy to find info) that 8mm screws were more appropriate so I pulled the McMaster screws from my Macro and indeed the first couple threads were getting smooshed. I ordered 8mm screws and checked them. Good thread engagement and no smooshing.

So here are my thoughts-

10mm screws work. I think 8mm is better from a perspective of minimizing the torsional forces cranking the 10mm past where it’s really supposed to go.

I wouldn’t/ won’t use the plate. There’s no need when the optic is mounted correctly. If it comes loose there’s a bigger issue than what would be fixed with a plate or the mounting was done wrong.

Do you know the McMaster part number for the 8mm version?

[SoCalDep]

Do you know the McMaster part number for the 8mm version?

Not by heart. I can look it up if you want.

[WobblyPossum]

Not by heart. I can look it up if you want.

Thank you. I’d appreciate it.

[centex]

Do you know the McMaster part number for the 8mm version?


94414A713 Black-Oxide Alloy Steel Torx Flat Head Screws, M3 x 0.50 mm Thread Size, 8 mm Long, Packs of 100


This is pasted from my last order from them a few weeks ago.

[WobblyPossum]

94414A713 Black-Oxide Alloy Steel Torx Flat Head Screws, M3 x 0.50 mm Thread Size, 8 mm Long, Packs of 100


This is pasted from my last order from them a few weeks ago.

Thanks.

[RAM Engineer]

94414A713 Black-Oxide Alloy Steel Torx Flat Head Screws, M3 x 0.50 mm Thread Size, 8 mm Long, Packs of 100


This is pasted from my last order from them a few weeks ago.

I believe that is a Torx Plus drive size. Not sure how well regular Torx bits work on a Torx Plus screw.

[RAM Engineer]

Some people have reported issues with the supplied Holosun EPS Carry screws being a smidge long on some 365 slides. I believe those were the older slides that had the rear sight integral to the cover plate you remove to install the optic. Clusterfrack figured out the McMaster screws of the proper length, and I show those as M3 0.5 x 10mm Torx Plus flat head, part 384-0310-01-0100.

That does not appear to be a normal McMaster-Carr part number. I believe the actual 10mm pn is 94414A714 (posted elsewhere in this thread)

[centex]

That does not appear to be a normal McMaster-Carr part number. I believe the actual 10mm pn is 94414A714 (posted elsewhere in this thread)

http://www.mcmaster.com/catalog/130/3479/94414A713


You'll notice the link above is for the 8mm screw, and the item listed right below it is for the 10mm version you reference. These are both Torx Plus screws.

[RAM Engineer]

I know Duracell was mentioned a couple of times in this thread as to preferred CR1620 battery. But just as an FYI for those who care about such things:

Brand - Country of manufacture
Duracell - Indonesia
Energizer - Indonesia
Panasonic - Indonesia
Maxell - Japan by Hitachi
Toshiba - Japan?
Renata - Switzerland
Murata - Japan

[GJM]

I know Duracell was mentioned a couple of times in this thread as to preferred CR1620 battery. But just as an FYI for those who care about such things:

Brand - Country of manufacture
Duracell - Indonesia
Energizer - Indonesia
Panasonic - Indonesia
Maxell - Japan by Hitachi
Toshiba - Japan?
Renata - Switzerland
Murata - Japan

We have been using Renata 2032, 1632 and 1620 with great performance.

[G19Fan]

Have been quite happy with Duracell 1620s and have a bunch of them.

Would be open to trying Renata in future but no urgent rush to swap.

[Fsumach]

So I am fully aware this thread is dated, but I ordered an EPS carry green 6 moa for an older XL slide (plate includes sites). Do I need to put one of the Sig stickers that cover the slide on before mounting the EPS (I toyed with a Romeo Zero and it used one of these stickers)?

Thanks and sorry for the thread resurrection!

Mike

[HeavyDuty]

Timely that this one got bumped up - I will be putting my EPS Carry on a P365 slide (it used to be on a XL.) If anyone has spares of the appropriate fasteners, I’d love to buy a few once I confirm what I need.

[crosseyedshooter]

So I am fully aware this thread is dated, but I ordered an EPS carry green 6 moa for an older XL slide (plate includes sites). Do I need to put one of the Sig stickers that cover the slide on before mounting the EPS (I toyed with a Romeo Zero and it used one of these stickers)?

EPS Carry has a sealed bottom and doesn’t need the sticker/membrane to seal from the oils in the slide.



Timely that this one got bumped up - I will be putting my EPS Carry on a P365 slide (it used to be on a XL.) If anyone has spares of the appropriate fasteners, I’d love to buy a few once I confirm what I need.

If you decide you’ll need Torx Plus M3x0.5x8mm, PM me your address and I’ll send you some.

[Fsumach]

EPS Carry has a sealed bottom and doesn’t need the sticker/membrane to seal from the oils in the slide.




If you decide you’ll need Torx Plus M3x0.5x8mm, PM me your address and I’ll send you some.

Many thanks!!

[HeavyDuty]

If you decide you’ll need Torx Plus M3x0.5x8mm, PM me your address and I’ll send you some.

Thanks! I should know in a week or so.