Gorilla Machining 9MM Glock and Colt compatible BCG was specially built for 9mm AR-15 Carbines. This BCG works with Glock lower receivers. The carrier body of these Bolt Carrier Groups is made from 8620 Steel with a tool steel extractor bolt carrier group. This Bolt Carrier group is nitride QPQ Treated with a Rockwell rating of 72 giving you the hardness needed to last. It is fully assembled ready to install.
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