2個セット ミルスペック .223 キャッスルナット

Staked the upper on a bench and torqued these down with a standard armorer's wrench, no slipping or galling on the threads. The parkerized finish took the wrench marks without chipping, which is exactly what I wanted for a beater build. Two in the pack means I've got a spare for the next project, so

These fit my buffer tube threads without any wobble, and the staking notches lined up clean both times. Two identical nuts in the pack means I have a spare for the next build.

Installed these on two builds and the threading was clean, no binding at all during torque. The finish is a consistent matte black that matches the receiver extension perfectly.