Slim line design is shorter in overall length and width than the original AFG. Smaller size allows for compatibility with a wider variety of rail systems, rail covers, and accessory mounts. The AFG features a three-piece design with an interchangeable finger shelf that allows for a flat A1 surface or an A2 finger nub, depending on shooter preference. It mounts on standard 1913 Picatinny rails. All mounting hardware included.