Ultimate tool for barrel nut installs or removal Excellent for removing stubborn/seized barrel nuts without damaging upper Designed for muzzle device installs and will not damage index pin Can be used to install forward assist/port door cover Compatible with forged and billet upper receivers Machined from 4140 Ordnance grade steel. Durable Black Oxide finished for years of use. Will not mar or damage exterior of upper receiver. Receiver mounted sights can be left installed. Can be installed horizontally or vertically in bench vise. Works with any standard M4/M16 barrel extension. Specifications Brand: Midwest Industries Manufacturer part #: MI-URR UPC: 812102032151 Category: On Gun & Other Accessories › Barrels & Accessories Shipping weight: 2.67 lb Country of origin: US Ships fast from GunCycle — free economy shipping on orders $99.99+.