The Midwest Industries Upper Receiver Rod is designed to hold a LR308 or .308 AR-10 upper receiver and barrel. Compatible with forged and billet LR308 and AR-10 upper receivers. The Upper Receiver Rod can be installed horizontally or vertically in bench vise and is excellent for removing stubborn/seized barrel nuts without damaging upper or for muzzle device installs. Machined from 4140 Ordnance grade steel with a durable Black Oxide finished for years of use. 100% Made in the USA.