C&H Precision V4 MIL/LEO Adapter Base Plate converts Glock MOS pistol platforms (models 17, 19, 20, 21, 22, 23, 34, 35, 40, 41, 45, and 47) to accept Holosun 509T footprint red dot optics. Machined from mild grade steel with a black anodized finish, this red dot optic mount provides a rigid, low-profile interface for enclosed reflex sight attachment. The set includes the optic plate and mounting hardware. Safety Note Always ensure the firearm is unloaded before installing or adjusting any optics or bases. Verify proper torque specifications during installation. Improper mounting may affect accuracy and safety.