This Weaver Extended Multi-Slot Tactical Picatinny-Style Base is just what you need for your rifle. These bases are constructed of aluminum so they won't add much weight to your rifle, but they are strong enough to withstand the heaviest recoil. The multiple slots provide you with plenty of space for mounting optics and allow you to position your scope for optimum eye relief. This base has 20 MOA built in to allow for shooting at longer ranges. Weaver Rem SA 20 MOA 99485 multi-slot base 1-Piece/extended. Hunting scopes mounts. Made of the highest quality materials Fits Savage Model 10 Short Action 4.275 4.4 spacing Manufactured from 6061 T6 aluminum Protected by a matte, Type III hard coat anodized finish Provide an additional 1 inch of forward length for more mounting options Picatinny bases are designed for specific models of firearms provide an additional 1 inch of forward length for more mounting options Manufactured from 6061 T6 aluminum Protected by a matte, Type III hard coat anodized finish No slip/strip Torx screws