Ever dealt with those stubborn barrel nuts that just won't work loose? The Midwest Industries AR-15 Upper Receiver Rod is designed as the perfect tool for AR builders looking to overcome stubborn, stuck parts. Each Midwest Industries AR-15 Upper Receiver Rod is machined from 4140 steel, an ordnance-grade metal that's designed to handle abuse. The working end of the tool is sized right for any standard AR-style barrel extension and will remove seized barrel nuts without harming the upper receiver. Other uses for the Midwest Industries AR-15 Upper Receiver Rod include installing muzzle devices, forward assists and dust covers. The unit is protected with a black-oxide finish and won't damage the finish on your rifle.