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The Advanced Armament 300 AAC Blackout 12.5" Upper is a a complete receiver assembly. It is a 12.5" Nitrided 1:7" twist barrel that is also threaded at 5/8-24. It has an AAC 51T Blackout Flash Hider, "Full Auto" BCG, and KAC URX Rail. It is ready to drop onto your AR15/M16/M4 lower with Mil-Spec push pin locations.
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