5.56MMX45 NATO BOLT CARRIER GROUP FOR AR-15

This high quality bolt carrier group is a valuable addition to your AR15 build. 11.52 oz. 5.56 CHROME LINED PHOSPHATE BCG: Available with or without “A” Logo M16-cut carrier Machined from 8620 steel Carrier has forward assist serrations Mil-Spec phosphate coating Properly staked gas key Chrome lined gas key and bolt channel 5.56 Bolt is machined from Carpenter 158 tool steel Shot peened HPT tested/MPI marked Black o-ring insert on extractor High quality BCG 5.56 NICKEL BORON BCG No Aero 'A' Logo Machined from 8620 Tool Steel (Carrier) and 9310 Steel (Bolt) Carrier has forward assist serrations Shrouded firing pin Nickel Boron Coating inside and out (Bolt, Carrier, and Gas Key) Forged Mil-Spec gas key attached with Grade 8 hardware and Properly staked. 5.56 Bolt is shot Peened and MPI Mil-Spec Extractor Spring, black extractor insert, Viton O-Ring Tool Steel Extractor High quality BCG 5.56 BLACK NITRIDE BCG With or Without Aero 'A' Logo M16-cut carrier Machined from 8620 Tool Steel (Carrier) and 9310 Steel (Bolt) Carrier has forward assist serrations Black Nitride Finish - advanced lower friction coating that minimizes the need for lubricants and cleaning Properly staked gas key Shot peened