Grid Defense Complete Upper Receiver 5.56mm 10.5 inch Carbine Length 4150 Steel M4 Barrel 1-7 Twist A2 Flash Hider Tactical Grape GD105E9GFR556GRP. 56 Upper Receiver. Grid Defense constructed these Mil-Spec AR15 Upper Receivers from 7075 T6 aluminum...
Grid Defense Complete Upper Receiver 5.56mm 10.5 inch Carbine Length 4150 Steel M4 Barrel 1-7 Twist A2 Flash Hider Tactical Grape GD105E9GFR556GRP. 56 Upper Receiver. Grid Defense constructed these Mil-Spec AR15 Upper Receivers from 7075 T6 aluminum...