Leupold 171498 Mark 4 Long Range Picatinny-Style Scope Base

Leupold mounts are every bit as rugged and dependable as the Leupold optics they_re intended to secure. With a huge variety of mounting systems for nearly every type of firearm under the sun you're sure to find the perfect match for you firearm and your style of shooting.

MOUNTING LARGE RIFLESCOPES ON LARGE CALIBER FIREARMS WITH CONVENTIONAL 6-48 SCREWS IS NOT IDEAL AS THE INCREASED RECOIL AND SCOPE WEIGHT CAN OVER-STRESS THE SMALLER SCREWS AND LEAD TO POSSIBLE FAILURES. MORE RUGGED 8-40 SCREWS INCREASE MOUNT STRENGTH BY 41 percent.

Leupold's Mark 4 8-40 Adaptable Mount - ls available in a 20-MOA Long-Range Shooter version - is the first mount that can accommodate both the 8-40 screw and a modified 6-48 shoulder screw. Larger through holes accept the thicker 8-40 screw while the standard 6-48 screw has been replaced by a shoulder screw to work with the larger opening. This gives you the flexibility to mount your rifle with the common 6-48 screw size or drill and tap your gun to accept the 8-40 screws.

These bases will fit Winchester PBR Remington Super Magnum HS Precision and other 8-40 rifles without modification. (Some firearms will not work with these adaptable mounts)