Avoid the wrench - NcSTAR AR15/M4 Gunsmithing Tool Kit w/Roll-Up Mat

Read some reviews that the wrench was not high quality and other reviews that said it works fine. I figured I could make it work as long as I kept it perfectly square to the castle nut. I learned the hard way that the cheap metal gives regardless (at the expense of damage to my lower). The rest of the kit is fine and did everything I needed without issue. I gave this two stars for the remainder of the kit. Otherwise, I'd only give one star for the quality of the armorer's wrench.