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its just screwed on using a 'wave washer" no thread locker required

Hi Jared and welcome. This is secured by a wave washer as shown here: https://www.reddit.com/r/RugerMK/comments/17du0e3/mark_iv_lite_wave_washer/ ------------- I would still apply a little loc-tite blue on the flash hider threads to ensure no back out. Cheers, stay safe and enjoy!

Hi Jared, no Loc-Tite is required. The installed wave washer will keep it from coming loose >>> reddit.com/r/RugerMK/comments/17du0e3/mark_iv_lite_wave_washer/ Stay safe & have a great day!