I posted about my failures in mounting the CNC Warrior 4-pc flash hider onto my AK-P.
I returned that flash hider but wanted to try again with another brake, thinking there was something wrong with first flash hider.
I bought a used one a few weeks later (slimmer version but has the same threading). That one would not screw down fully flush, either. I decided to keep the flash hider but was going to ask for an RMA of the pistol, thinking there was something amiss with the threads or muzzle.
Last night, I did some research and found a few folks having the same issue but with other rifles and pistols (some non-AKs). One guy said he took a copper brush to the threads of the muzzle and the threads of the flash hider, and had success in fully screwing down the brake. I tried it and it worked! There was a lot of crud on the threads of the muzzle and flash hider (the muzzle device was used and not clean).
I’ll be taking the AK-P to the range this week to test the new muzzle device.
UPDATE (8/5/2025): If you’re curious about how well the flash hider works, have a look at the below – while there’s still flash, I could not see it behind the gun with the 4-pc hider (I can see tons of flash with the OEM booster):