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The CMMG  55BA419 BOLT CARRIER GROUP is a Mil-Spec part made for the M16 in 5.56 caliber. This also works great for the AR-15 in .223/5.56! (M16 bolt carriers are Mil-spec and work with both full-auto and semi-auto rifles, including the M4, AR15, and M16!). Pick the drop-in replacement and go for the 55BA419 Bolt Carrier Group.   FEATURES: Complete...