TruGlo Picatinny Optic Rail for use with drilled and tapped receivers. Made of CNC-machined aircraft grade aluminum and compatible with Picatinny and Weaver-style rings or mounts. Includes screws and wrench. Fits Mossberg 500/590/590A1/835 & 930 series, 12 & 20 gauge shotguns. Model Picatinny Optic Rail Style Picatinny Pieces 1 Material Aluminum Mount Type To Receiver/Picatinny/Weaver Rings Included No