The worst damage you can do building your own AR is over torque the barrel nut and crack the upper, if you're a fucking gorilla, or mar the anodising on your upper/lower slipping with a punch.
The worst damage you can do building your own AR is over torque the barrel nut and crack the upper, if you're a fucking gorilla, or mar the anodising on your upper/lower slipping with a punch.
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