Weaver 99505: Weaver bases provide a precision fit and accommodates your modern sporting rifle, competition pistol, inline muzzleloader or bolt-action hunting rifle. The Tactical Picatinny Extended Multi-Slot Base provides an additional 1-inch of forward length for more mounting options. It features an integral recoil lug and no slip/strip Torx screws. Manufactured from 6061-T6 aluminum with a matte hard coat anodized finish, this multi-slot base is compatible with Picatinny or Weaver style rings. This model is compatible with Remington 783 long action rifles.