Talley Winchester Model 70 Long Action Picatinny Base Features The 20 MOA of taper machined into the rail is the feature that matters most at distance because angling the optic downward relative to the barrel returns elevation travel that would otherwise be consumed just reaching a 100 yard zero. That reclaimed travel is what allows a scope to keep dialing at ranges where a flat base would run out of adjustment and leave the shooter holding into empty space above the reticle. Because the base carries numerous slots rather than a fixed pair of ring locations the scope can be positioned along its length to set eye relief for a specific shooter stock and optic combination. For long range hunters and target shooters building on a Winchester Model 70 that combination of extra elevation and free ring placement is what makes a rail worth installing. Machining the base from aluminum as one piece keeps weight down on a rifle that is already carrying a heavy barrel and optic and it eliminates the alignment mismatch that separate front and rear bases can introduce into a ring set. The rail accepts Picatinny rings and most Weaver style rings so a shooter can carry over the rings already in the safe rather than buying an entirely new mounting system with the base. A single base covers the long action receiver giving the scope one continuous machined surface to clamp against instead of two independent contact points that can shift at different rates under recoil. For Talley customers upgrading a Model 70 into a serious distance rifle this 20 MOA Picatinny base is available for sale at GrabAGun. Talley Winchester Model 70 Long Action Picatinny Base Specifications Brand: Talley Model: Winchester Model 70 Long Action Picatinny Base Fits: Winchester Model 70 Action Type: Bolt Action Action Length: Long Mount Type: Picatinny Rail Elevation: 20 MOA Material: Aluminum Finish: Black Number of Bases: 1 Ring Compatibility: Picatinny and Most Weaver Style Rings Available At: GrabAGun