C&H Precision mounting plate that adapts the Glock MOS optic cut to accept Holosun K-series red dots (407K, 507K) and other RMSc-footprint micros. Direct fit, no machining required. Compatibility: Slide cut: Glock MOS (Gen 4 / 5) Optics: Holosun 407K, Holosun 507K, RMSc-pattern micros Includes: mounting plate + screws. GLOCK is a registered trademark of GLOCK Inc. 3CR Tactical is not affiliated with, endorsed by, or sponsored by GLOCK Inc. Any reference to GLOCK products is for identification and compatibility purposes only.