Internally, the hard, clean finish of BN graces many in the critical components including the magazine tube, gasoline piston, fuel ring, hammer and sear. Simplicity of cleaning is usually a secondary advantage of the coating. Possessing it over the parts in the 940’s redesigned fuel system guarantees reliability. According to https://arthurnesgt.rimmablog.com/28777033/the-best-side-of-mossberg-590a1-retro