The Flatback/Invincible Glock Switch is a professional-grade, select-fire conversion system engineered to provide reliable and controlled fully automatic capability within the Glock platform. Machined from 4140 chromoly steel and 7075-T7351 aluminum with a MIL-SPEC Type III hardcoat, this legally regulated NFA device enables seamless transition between semi-automatic and automatic firing modes (approx. 1,200 RPM) via a low-profile, snag-free selector. Its mechanically timed, inertia-driven design ensures dependable operation and is built to withstand sustained fire.