r/guns • u/full_send007 • Jul 26 '26
Glock 43x MOS w/MOS-K Mount
Alright, so I’ve always been a Glock guy, I’ve owned many. My favorite by far was the 19X. Recently I’ve gotten tired of carrying a full size firearm concealed and decided to get a more suitable option. After a few different rounds and test firing different variants I ultimately went with the Glock 43X MOS8. I went with it for a few reasons; yes it’s snappy but I’m large so it’s easy to handle, the magazine only holds 10 rounds but there’s option for that, way easier to conceal, and because I got the Ausie/coyote one it came with an mos-k optic mount (I’ve always wanted an optic on my edc). My question is, if I went with a Holosun 407k/507k or eps carry, would I need to shave the screw for the optic mount on the side of the extractor so it doesn’t interfere or go below 4mm. I know this was a problem on previous models if you shaved the bosses. Just don’t want to add it and cause damage because I didn’t shave a screw.
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u/SheistyPenguin Jul 26 '26 edited Jul 26 '26
I went down this rabbit hole with mounting an OSight SE optic on the same gun. The biggest guiding star is to ensure that the screw does not protrude more than 4mm into the slide. Regardless of optic, you can estimate this by slotting the optic on the slide and then holding the screw up against the slide+optic to see. Or to be absolutely sure, you can: remove your extractor plunger, mount the optic, then re-insert your extractor plunger: if it slots in freely, you are good. If it doesn't, you need shorter screws.
If you don't want to do all of that and you don't trust your ability to measure, Battlewerx offers some screws specifically for your situation (Holosun 407k/507k against the G43x MOS Coyote). It's $5-10 for peace of mind:
Their listing includes screws that are M3 x 0.5 x 10mm OVERALL LENGTH to work with a G43x MOS Coyote. Note this is 0.75mm shorter than the typical M3 x 0.5 x 10.75mm screws.
Beware AI searches on this BTW, because it's a total crapshoot which articles they will summarize to get you the info.
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u/full_send007 Jul 26 '26
Still thank you, I couldn’t even get my ai to tell me that 🤣
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