NcSTAR Armorer's Wrench, Generation 2, For AR-15, Matte Finish, Black TARW2 M4/16/AR15 Armorer's wrench Gen 2 has multiple tools combined in one package which assists in disassembling/ assembling of M4/16/AR15 type rifles. The slim profile wrench has multiple functions to attach traditional barrels/foregrip and free-float handguards.