Rail type: Picatinny. Machined from: Solid 7075 T6 Aircraft Grade Aluminum Finish: Matte Black Center Expansion: 4.1" Overall Bracket Length: 5.882" Height: 0.35" (top of receiver to top of Picatinny) Weight: 2.5 oz Quick Detach Ring Compatible: Yes Ambidextrous: Yes Compatible with Picatinny or Weaver scope rings. Mounting: #6-48 x 1/4 Screws and T-10 Bit Included Torque Specs: 20 Inch/Pounds We recommend measuring the hole spacing on your receiver for confirm that it matches the dimensions we have published. Picatinny cross slots cover the entire length of the rail, giving the shooter flexibility when mounting sight rings and other accessories. The channel in the center reduces the. overall mass of the mount. Plus, in many cases, it will not obstruct the use of factory iron sights. Our one-piece scope mounts are the obvious choice for hunters and tactical shooters alike. We manufacture them in our store using one of our machining centers. After machining, the brackets are turned, sanded and Type III anodized for long lasting durability. Installation: We recommend 20 inch pounds of torque and a blue loctite drip (loctite is available through our website and sold separately). We recommend: 0 MOA - if you shoot from 0 to 450 meters. 20 MOA – if you shoot 500-1000 yards. When zeroing your rifle with a 20 MOA mount, we recommend zeroing it at 180 yards. All bracket and accessories (from mounting screws and wrench to packaging) are made in the United States.