Mud Test: Sig MCX Spear - US Army NGSW
This guide details a rigorous mud test performed on the Sig MCX Spear, the US Army's NGSW choice. It covers initial function checks, extreme mud application with both open and closed dust covers, and systematic clearing techniques for failures to feed, fire, and eject. The analysis highlights the challenges piston-driven systems can face in such conditions and the importance of understanding gas settings.












