ODIN BCG AR-15 .223/5.56 BLACK NITRIDEODIN BOLT CARRIER GROUP AR 15 . 223 BLACK NITRIDE FEATURES Fits AR 15 M4 compatible style rifles Mil spec dimensions Bolt Carrier Group Material: Case hardened 8620 Steel Finish: Black nitride Gas Key: 4130 steel attached with Grade 8 hardware & properly staked into a milled "valley" to ensure proper positioning Cam Pin: Hardened 4340 cam pin Firing Pin: Mil Spec firing pin made of 8740 steel, center less ground & hard chrome coated Bolt Assembly: The
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