Shop › NCSTAR AR15 BUFFER TUBE/CASTLE TOOL NCSTAR AR15 BUFFER TUBE/CASTLE TOOL $16.99 NcSTAR AR15 Crows Foot Lower Pro Tool, For Use on AR15 Castle Nut and A2 Buffer Tube Wrench, Steel Construction, Matte Finish, Black VTARCFLWRPRO Quantity: Add To Cart Added! NcSTAR AR15 Crows Foot Lower Pro Tool, For Use on AR15 Castle Nut and A2 Buffer Tube Wrench, Steel Construction, Matte Finish, Black VTARCFLWRPRO