AR-15 Bolt Carrier Group .223/5.56 NATO/.300 Blackout/.350 Legend - Shooter's Connection(BCGs) are Magnetic Particle Inspected (MPI) to ensure high performance. 5. 56 223 BCG is made with durable 9310 Steel and the gas key is also staked from the side for enhanced durability. Specifications: Caliber: . 223 5. 56 NATO . 300 Blackout . 350 Legend Carrier Style: Standard Platform: AR 15 Bolt Finish: Parkerized Bolt Material: 9310 Steel Carrier Finish: Black Nitrid Gas Key: Staked from the side to increase longevity Magnetic Particle
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