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Bushmaster M4 Complete Upper 5.56x45mm NATO for AR-15

Bushmaster M4 Complete Upper 5.56x45mm NATO for AR-15

Product Features & Specifications Bushmaster 0040017BLK QRC Complete Upper 5.56x45mm NATO 16" Black Nitride Barrel, Aluminum Black Hard Coat Anodized Receiver, M-LOK Handguard for AR-15 Caliber:223 Rem/5.56 NATO, Barrel Length:16, Barrel Material:4150 CMV, Barrel Finish: Salt Bath Nitride, Barre