VIBRA-TITE VC-3

Used this on my holster screws that would work loose every couple of range sessions, and they've stayed rock solid for a month now. The fact that it's reusable is a huge plus since I can readjust without fighting a permanent bond.

Used it on my holster and optic mount screws and they’ve stayed rock solid through hundreds of rounds at the range. The fact that it stays tacky and lets me reuse the parts without fighting a permanent bond is exactly what I needed.

Reapplying is a breeze since it stays tacky and doesn't harden into a brick, which is exactly why I grabbed it for a rifle mount that kept loosening on the range. Even after a couple of disassemblies, the threads still hold tight, so it's genuinely reusable like it says.