Ultimate Arms Gear Pistol Handgun Scope Mount for Sights, Lasers, Lights and Accessories Fits Hi - Point Hipoint & FNH USA FNX FNP FNP-45 Five Seven Pistols Constructed from Precision Machined Aircraft Grade Aluminum Alloy. Fits on Most Pistol Accessory to Provide a Solid Style Platform for Most Optics. Provides A Standard 7/8" 12 Slot Top See-Thru Designed & 3 Slot Bottom - For Attaching Scopes, Sights, light, lasers etc. Specifications: Length 5" inches. Weight 3 oz. Easy to Install. 2 Set Screws Lock Tight to Existing Rail.