I would talk to Bert about what you want , the flash hider( $200 ) does not need to be timed , the brake ( $220 )version does , I think those are the prices for the rachet muzzle devices , do not have a price on the can , the specs are 3/4-24 & 5/8-24 threads for 7.62 & 1/2-28 for 5.56 , OAL is 189mm , dia is 38.5 , Wt is 170gms ,
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