What is a good thread locking compound for a threaded barrel?

cash_tx

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I recently bought a semi auto 22LR pistol that has a barrel threaded for a suppressor. I don't plan on attaching a suppressor to this gun anytime soon, so just leaving the cap in place for now. However, when I was test firing the gun earlier today; I noticed the thread cap was working loose after about two magazines or so. I was thinking about putting a small amount of Loctite 242 Blue on the threads, but is there a more appropriate thread locker for this application?
 
Clear fingernail polish typically does a decent job for temp locking threads…

Just raid that women’s make up stash I know you keep, and you’ll be good..

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