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