This Burris pistol optic plate mounts a red dot to a large-frame Glock chambered in 45 ACP or 10mm without milling the slide. It seats in the factory rear-sight dovetail and accepts the Burris FastFire / Docter optic footprint. Features: Host: large-frame Glock in 45 ACP / 10mm (mounts in the rear-sight dovetail, no slide milling) Optic footprint: Burris FastFire / Docter pattern Machined aluminum, black finish Mounting hardware included Confirm your Glock uses a compatible rear-sight dovetail before ordering. 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.