The GST-9 MOD 1 80% Lower Pistol Frame Jig is a precision-engineered tool designed to streamline the process of completing an 80% lower frame into a functional pistol frame. Compatible with the GST-9 MOD 1 platform, this jig features durable, high-quality materials that ensure accurate cutting, drilling, and shaping. It includes pre-aligned guides and drill bits to simplify the process for both novice and experienced builders, reducing the risk of errors while maintaining strict tolerances. Its modular design supports repeatable builds and offers clear instructions, making it an essential tool for firearm enthusiasts seeking customization and performance enhancements in their pistols.