ATI Outdoors Castle Nut for AR-15/AR-10 Rifles, Black - A5101020
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ATI Outdoors Castle Nut for AR-15/AR-10 Rifles, Black - A5101020, This steel AR-15 castle nut is virtually indestructible and works with commercial, military, and hybrid buffer tubes. It fits most AR-15s and AR variants, but it is not compatible with 308 rifles. Features:Works with commercial, military and hybrid buffer tubesVirtually indestructibleManufactured in the USALimited lifetime warranty