SGM Tactical SSGMP76230: All SGMs mags are engineered through CAD (Computer-Aided Design) systems and manufactured to SAE standards in an ISO 9001:2010 approved manufacturing facility right here in the USA. SGMs injection molds are cut from P20 pre-hardened tooling steel, and the retractable cores are cut from S-7 heat-treated steel. The Dupont composite/glass-filled polymer was specifically chosen to provide an extremely durable, internally slick, fast-feeding mag that will provide years of service. The springs are slightly longer to provide more uniform pressure and are specially coated to provide smoother action and resist moisture. These magazines are perfect for those of you who have been holding on to originally imported Saiga rifles.