M4/16/AR15 Armorer's wrench Gen 2. Multiple tools combined in one package which assists in disassembling/ assembling of M4/16/AR15 type rifles. Slim profile wrench with multiple functions to attach traditional barrels/foregrip and free-float handguards. NcSTAR proudly introduces the 2nd Generation AR15 Armorer's Wrench. Packed with most of the special tools required to work on your AR15. Barrel wrench works with GI Spec barrel nuts/ free float tubes, and with some types of commercial style barrel nuts (DD & YHM). �" & ?" Drive sockets for your Torque wrenches. �" & ?" wrenches for GI and some commercial Muzzle Brakes. The wrench is just the right thickness to fit the some of the commercial muzzle brake narrow flats, where your typical combo wrenches are too thick to fit the narrow flats.