Seems to hold up fine - Tacfire AR15/M4 Combo Wrench Tool

Have only used this tool for tightening a muzzle device and the buffer assembly castle nut. The coating on it makes this tool out of spec, however it can be sanded off to work properly. I sanded down the coating and a bit of meat off the muzzle device wrench then put some electrical tape over the bare metal to keep it from scratching.