GI JOE Posted September 14, 2010 Posted September 14, 2010 hi guys iv just got myself a new tightbore barrel for my sig 551, now all i need to know is how do i take the dam hop unit apart to fit it??? its a barrel type hop unit, theres ne screws or anything on it just a little retaining pin holding the adjusting arm in place. looked all over the net, tried google, youtube etc but cant find anything relevent to this type hop unit.
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