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Daniel Defense M4A1 Upper chambered in 223 Rem/556NATO, 16″ (14.5″ with Pinned Brake) Barrel, 1:7 Twist, with M4 12.0 Rail.
Mil-Spec upper receiver with indexing marks and M4 feed ramps. CNC machined of 7075-T6 aluminum and Type III hard coat anodized. Pinned low profile gas block is CNC machined of 4140 hardened steel, Mil-Spec heavy phosphate coating, carbine length, direct