Cz858 muzzle adaptor

If your asking why a Cz 858 muzzle is threaded, is because u can add a flash hinder or muzzle brake to it yes, u have to remove the thread protector of course then hold down the pin untill the brake is as far as it can go (threaded on) then line up the pin and the pin slot on the brake, some have multi slots for pins as most have 1 slot.
 
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