The ATI GSG-MP40 9MM 922R Compliant Stock Kit delivers a robust, USA-made upgrade for enthusiasts seeking a durable, reliable stock solution for the GSG-MP40 platform, blending practical function with a clean parkerized finish. This stock kit features a 12L14 steel folding stock with a folding butt plate for compact storage and field-ready versatility, paired with a cold rolled steel magazine floor plate and a 4140 steel thread protector to enhance longevity and corrosion resistance in demanding environments. The HDPE polyethylene Thermoplastic magazine follower adds smooth, consistent feeding and reduced wear, while every component is manufactured in the USA to ensure tight tolerances and superior build quality. Designed to integrate seamlessly with the GSG-MP40, the kit provides the stability and secure fit shooters expect when engaging in dynamic training, precision shooting, or field use, all while supporting 922R compliance through its high-quality, compliant components. With Parkerized finishes that resist wear and maintain a low-reflective profile, this stock kit optimizes handling, balance, and control, making it a practical, long-lasting upgrade for those who demand performance, reliability, and a professional-grade upgrade path for their firearm ensemble.