Have a never used ported Boss buster from Preston Pittman. Doesn't list the constriction..Trade for a remchoke .655 or inv+ 670 .The choke I have fits Mossberg 500 ,invector, Winchester, h&r, savage, Thompson center,and ithica... :OGturkeyhead:
i have a few rem chokes let me check when i get home at what they are
traded thanks for the interest