Vector Optics Sphinx Red Dot Pistol Mount Base Heckler & Koch USP VO Sphinx/ Vortex Venom/ Burris FastFire 6061-T6 Black. 08 in Length: 1.8 in Weight: 0.6 oz Gun Make: Heckler & Koch Gun Type: Pistol Width: 1 in Finish: Matte Features of Vector Optics Sphinx Red Dot Sight Pistol Mount Base for Heckler & Koch USP Only install onto HK USP pistol Designed for real firearms Package Contents: Vector Optics Sphinx Red Dot Sight Pistol Mount Base for Heckler & Koch USP 2 screws 1 bar 1 plate What firearm models does the manufacturer say Vector Optics Sphinx Red Dot Sight Pistol Mount Base for Heckler & Koch USP is compatible with? The manufacturer suggests that Vector Optics Sphinx Red Dot Sight Pistol Mount Base for Heckler & Koch USP is compatible with Heckler & Koch USPVector Optics SCRDM-07: Sphinx Red Dot Pistol Mount Base Heckler & Koch USP VO Sphinx/ Vortex Venom/ Burris FastFire 6061-T6 Black