It’s pussy ass blue loctite. Problem was I didn’t use the mounts supplied screws which catch, 3 full threads or so. I used trijicon screws which caught 6 full rotations, and blue loctite, still wasn’t scared, but a shallow ass torx head can get you everytime.
I used factory suppliesd screws, three full rotations, hand tightened torque. And marked em. We’ll see if they hold.
if you’re putting an RMR on a pistol and don’t use somesort of thread lock you WILL lose your pistol red dot. PS90 receiver is definitely not a Glock slide so I’ll keep an eye on the marking and see if there’s any backing out. Also factory screws were deep cut Allen pattern which I prefer over torx. Seems like every torx individual blade is weaker than a regular Allen which is weaker than a square drive