barrel extension from hell
Trust me ,barrel extensions are a major B$#$* to get on . I also got one of sarco's "m4" bare barrel specials and put an extension on with the brownells barrel extension wrench and viceblocks. Trust me on this , I don't want to do this again anytime soon . It chambers a round and doesn't bind up any with the timing of the bolt carrier assembly when assembled on my a2 upper. Both the barrel extension pin and my barrel gas hole line up like they are supposed to aswell . Happy Holidays Guy's !