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14.5"
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AR-15 M4 5.56/.223 14.5" blue contour barrel. Threaded 1/2x28 for flash hider. 14.5” M4 5.56 CALIBER BARREL GAS BLOCK .750 M4 BARREL EXTENSION MATERIAL 4140 ANNEALED 1-7 TWIST CARBINE GAS SYSTEM PARKERIZED ..AR-15 M4 5.56/.223 14.5" blue contour barrel. Threaded 1/2x28 ...$129.95