Bad news: if you installed an optic, you likely damaged part #41 and #43 (left and right striker housing) on page 29 of the manual by installing this optic. I just found out mine’s damaged and so is a friend’s who installed a Holosun (I have the EPS Carry, and my friend has the 507k).
I’m holding that this is a design flaw in the PSA “optics ready” Rock. I think PSA should offer replacement striker housings that allow for standard length optics screws.
To see if yours is damaged, you’ll need to (1) remove your slide, (2) remove your optic, (3) depress the slide cap plunger (part #31) to remove the slide cap, slide cap plunger, and striker spring and then (4) remove the striker housing assembly by sliding it to the rear.
You can see the extra holes that were punched by the optics screws in these photos:
If you use the screws that ship with the pistol/slide, this won’t happen. That said, it’s an easy fix. Send me a pm and we’ll get you a striker housing and the correct length screws. Easy peasy
The Holosuns require a low profile head Torx screw for mounting or they will not fit flush with the top of the sight base. The required size that will not penetrate the striker housings is an M4x10mm screw.
The screws included with the optics cut slide ( at least both of my slides ) did not have a low profile head and did not fit flush with the top of the Holosun.
The only way to get the correct size screws with the low profile head and with the matching finish is to cut the M4x12mm screws included with the Holosun to 10mm in length.
If you don’t care about the screws having a matching finish you can purchase low profile head M4x10mm Torx screws in polished stainless steel at https://us.misumi-ec.com/vona2/detail/221000236208/?HissuCode=SSTS-M4X10
On a side note I bought the 407k and had it installed by the range @ PSA before the other screws were provided. Took it apart, ground the screws down, reassembled and it’s been running fine ever since. I got one early on.
Does this actually matter? Inspecting this I don’t see how this is going to cause any functional problem.
Ideally I’d probably consider having the striker housing redesigned with a gap/hole there if there’s no real structural problem with doing that and just avoid the issue entirely.
All that said, once I figure out how to send a PM I’m gonna need to get a replacement striker assembly as well.
I just sanded the sharp edges from the side that cracked /chipped away to take out the stress risers. the other side is stopped @ the thicker part. pushed it back up flat. Long term it may be an issue, I’m just waiting on them to show up to buy a pair JIC.
I did some caliper measurements on the inside of the slide: it looks like the Holosun original 11.76mm screws need to be shortened by 3mm, for a total of 8.76mm length after shortening. Right now, I’m thinking: put a locking m4 nut with 3mm sticking out and then grind down to that.
I measured the depth of the optics mounting holes from the top of the optics cut out to the top of the striker housing at 3.84mm. To determine the maximum length of the screws that won’t penetrate the striker housing, just measure the thickness of your MRD base ( where the mounting holes in it are located ) and add 3.84mm. If you make them slightly shorter you’ll make sure to account for any slight measuring errors.
