A 5.56 bolt carrier group (BCG) is a critical component for AR-15 rifles chambered in 5.56 NATO or .223 Remington. It includes the bolt, carrier, gas key, firing pin, cam pin, and retaining pin. The 5.56 BCG works with AR-15 upper receivers, 5.56/.223 barrels, charging handles, and lower receivers. It ensures reliable cycling, chambering, extraction, and firing, making it essential for building or upgrading AR-15 platforms in 5.56/.223 calibers.
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