Flash hider on type 81 question?

[JohnAsmith]

Hey I’ve got a flash hider on my type 81 SR, originally I had it hand tight and noticed it was coming loose after a couple range trips, how should it be installed? Should I put thread locker on the threads? Also how much should it be torqued down? I got the flash hider from tac imports and it doesn’t come with any instructions or torque specs I’m guessing I shouldn’t crank it down with channel locks right? Also no crush washers were included although the type 81 has this spring loaded pin that I assume is supposed to put pressure on it to prevent it from coming loose