Ultimate Arms Gear Pistol Handgun Scope Mount Fits Smith & Wesson S&W 1911 M&P SD9 SD40 Pistols + Micro Compact Green Dot Open Reflex Sight/Scope Package Includes: Pistol Scope Mount + Micro Compact Green Dot Open Reflex Sight 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. Micro Green Dot Sight is Lightweight Super Compact And Crystal Clear Glare Free, Shock Proof & Fully Coated With An Anodized Finish For Heavy Duty Recoil And Includes A Lifetime Manufacturer's Warranty. Parallax Free & Unlimited Eye Relief Provides The Shooter A Wide Field Of View And The Ability To Operate With Both Eyes Open. Lithium CR2032 Battery, Protective Cover, Windage & Elevation Dial Tool Included. Easy to Install. 2 Set Screws Lock Tight to Existing Rail.