labradankFor sale is one bolt carrier from Surefire. They are advertised as being beneficial to rifles with suppressors attached. Each one comes as a set with a complete bolt carrier group, buffer, and buffer spring. To my knowledge, it should 'only' be used in tandem with the included buffer and spring. These carriers have been in rifles and dry fired, but have not had a single round fired through either. I have discovered they do not play well with Atrius/lever-style FRT's. The little dead blow device gets in the way of the lever moving back and forth and requires modification/dremeling to make clearance. Otherwise use a cassette style FRT like the ones from Rarebreed or Triggered. Buy one for 260 [only one left!] more information here: https://www.primaryarms.com/surefire-optimized-bolt-carrier-group-5.56-nato?quantity=1&custcol_pco=Orphan
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