Not to beat this dead horse some more, okay, I’m gonna beat the dead horse some more. I put witness marks on every single optic I’ve ever installed. I think we can all agree that while the Romeo 5 is near the top of the heap as far as low end, cheap red dots are concerned, it’s still far from what anyone would consider a high quality optic. I and many others can personally attest that the screws that come with it are pretty crappy. Several years ago I put a Romeo 5 on a KSG25 12 gauge shotgun. This is a pump action shotgun that will punish your shoulder mercilessly with massive felt recoil anytime you load it with anything hotter than field loads. When zero’ing this optic I used 2 3/4” Federal Truball slugs ( 1300fps). After 6 rounds I really didn’t want to shoot this bastard again. And it’s not as if I’m shy or new to shotguns with hot, magnum loads.
Anyway, cheap ass Chinese screw installed with no LocTite, check. Over 2500 rounds since, mostly slugs, 00B, #1 and #4, check. Witness marks just where I put them and optic still zero’ed, check.
I have a total of about 10-12 dots between shotguns, ARs and handguns. I shoot most of these guns very often. I use a Chinese Wheeler torque driver and no LocTite. Never had one come loose.
I’m confident in making the claim that your 9mm faux 1911 isn’t going to shake off a quality optic, installed to proper torque specs, with no thread locker. If it does you have other issues going on.
That said, if you use blue or purple LocTite and properly torque the screws, accounting for the fact that you have lubricated that screw with liquid, you should have no problem removing that screw provided you use a well fitting, hardened Torx driver and not a Chinese Torx bit in a universal driver. And if it brings you peace of mind it’s a win. Right ?