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ICS sig551 hop unit.

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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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