Designed for use with Magpul Dynamics "thumb break method" of rifle shooting, the Rail Vertical Foregrip (RVG) is an effective, light weight, and ergonomic vertical grip. All mounting hardware as well as a custom fitted universal mounting rail are included. Features and Specifications:Manufacturer Number: MAG412-BLKEffective, light weight, and ergonomic vertical gripCustom fitted universal mounting railAll mounting hardware includedBlackMade in the U.S.A.Fits:1913 Mil-Spec Picatinny Rails