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Lightweight mounts fit over and attach to both sides of the receiver to give balanced support for any scope. Strongly built to withstand even hard-hitting slug recoil. Installs in minutes; just remove the trigger group pins and replace with bolts included. Use Weaver-style rings (not supplied). Mfg: Aimtech SPECS: Aluminum, black, anodized finish. Approx. 6" (15.2cm) long, 2 1/2" (6.3cm) high. Includes bolts, wrenches, instructions.