Some time back I bought something and it came with a little sample plastic baggie of Vibra-Tite VC-3.
(wow that is really descriptive and informative, right?)
Being the cheap guy that I am, I cut a tiny little cut into the bag and slowly used up the sampler on optics and accessories screws. Unlike Locktite, this doesn’t fully harden, so it can be reused (up to 5 times they claim). The little sampler I used impressed me, so I went ahead and bought a bottle.
I kept having the tri-lug adapter come loose on the APC9K PRO. I am going to try using VC-3 thread locker to keep it in place. Unfortunately VC-3 is only meant to be used to 165 degrees F, but I want to see how well it works out, and check if I have any issues with bore solvent. I imagine it will probably work fine for this application.
While it isn’t really the right choice for a muzzle device, I would highly recommend this stuff for all the standard bolts and misc threaded connectors you have laying around. While I’m not going to throw away my bottles of locktite, I am going to mainly be using Vibra-tite for around my home.
Last note, with VC-3, you are suppose to coat the threads and let it dry before assembly. I didn’t know that until I bought this bottle.