IIRC That is justified by the existence of Armory Station, which is all of the instruments and staff of an arms plant moved into your Metro process, with primers both originating from pre-war stockpiles or being synthesized somewhere offscreen/offpage alongside what ever powder they’re reloading with. Dinwar claims: August http://travisvyzyz.amoblog.com/helping-the-others-realize-the-advantages-of-alliant-power-pistol-34428759