MarkD Posted February 20, 2016 Report Share Posted February 20, 2016 (edited) WTS: Original HK MR 556 FCG If You have a HK upper so the best way to function with Your any AR 15 lower.This HK hammer is the same one used in HK MR 556 lower or HK 416 lower. Is a Full auto hammer used by HK in theirs lowers. $175 shipped Edited February 23, 2016 by MarkD Link to comment Share on other sites More sharing options...
ThompsonCrazy Posted February 22, 2016 Report Share Posted February 22, 2016 Message sent. I would like to purchase. TC Link to comment Share on other sites More sharing options...
MarkD Posted February 23, 2016 Author Report Share Posted February 23, 2016 SOLD to ThompsonCrazy Link to comment Share on other sites More sharing options...
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