Knights Armament Company E3 barrel extension wrench. Part #KM30447 Never used, Unopened in original packaging.
This is the proper tool to securely hold a Knights Armament SR-15 or SR-25 upper receiver in a bench vise for rail or muzzle device work. This tool is compatible with SR-15 and SR-25 E3 Barrel Extensions ONLY. Shipping option available or FTF Orlando.