EGW Guns Scope Base Features The EGW Scope Base is machined from solid 7075-T6 aircraft grade aluminum giving it the strength to hold zero under recoil while keeping weight to just 4.6 ounces. Picatinny cross slots run the full length of the 6.276 inch rail so shooters have flexibility in positioning scope rings exactly where they need them. Built with 20 MOA of elevation this base is recommended for shooters working between 500 and 1000 yards and EGW suggests zeroing at 200 yards when running the 20 MOA configuration. The base is compatible with both Picatinny and Weaver scope rings as well as quick-disconnect ring systems giving shooters flexibility in how they mount their optic. After machining EGW tumbles sand blasts and anodizes each mount for long-lasting durability against the elements and daily handling. Mounting hardware including number 6-32 by 3/4 inch screws and a T-15 bit ships with the base and EGW recommends torquing to 25 in-lbs with a drop of blue thread locker for a secure long-term fit. The matte black finish resists glare in bright field conditions matching most CZ 457 rifles without drawing attention to the mount. Every part of this base and its hardware down to the packaging is made in the USA giving CZ 457 owners a durable American-made option for building out their rifle. EGW Guns Scope Base Specifications Manufacturer: EGW Guns Model: Scope Base Rail Type: One Piece Picatinny Material: 7075-T6 Aircraft Grade Aluminum Finish: Black Matte Overall Length: 6.276 Height: 0.54 Weight: 4.6 oz Elevation: 20 MOA Quick Disconnect Ring Compatible: Yes Compatible Hosts: CZ 457 Mounting Hardware: #6-32 x 3/4 Screws and T-15 Bit Torque Spec: 25 in/lbs Dovetail: 11mm Available At: GrabAGun