10 inch quad rail 10.5 inch barrell7/20/2023 ![]() Hard coat anodized MIL-STD 8625 Type 3 Class 2. Mil-Spec Upper Receiver machined from 7075 T6 aluminum with forward assist and dust cover installed.The 556 NATO barrel can safely fire both. 10.5 inch 556 NATO 4150 Chrome Moly Parkerized M4/Govt Barrel with 1x7 Twist, M4 Feed Ramp, and 1/2x28 Threads. ![]() 556 NATO and its twin 223 Remington are two of the least expensive, most available, and time tested calibers for the AR15. Designed to be highly effective, lightweight, and low recoil, 5.56x45mm has both military and civilian applications for self-defense, hunting and plinking. 10.5" 556 NATO Parkerized M4/Govt Barrel AR15 Upper Receiver with 10" Rail and A2 Flash Hiderĥ.56 NATO is arguably the most common, effective, and beloved caliber in the Western world.
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