The Angstadt Arms AA56BCGNIT is the vital cornerstone for a sturdy AR-15 assembly, boasting a superior 5.56 bolt carrier group assembly. This product is a testament to the same grade of quality that Angstadt produces for esteemed law enforcement and military bodies globally.Its precision machinings adhere to mil-spec dimensions, lending durability and superior performance. What enhances its appeal is the stunning black nitride finish, ensuring an aesthetically pleasing outlook while maintaining a reliable functioning for an extended period.