The Leupold Mark 4 one-piece base for Browning A-Bolt short-action receivers with a 20-MOA elevation offset (part no. 170750) is built for long-range shooting scenarios where the standard 0-MOA mount doesn’t dial far enough. Leupold machines the base from steel for rigidity under recoil, and an 8-40 adaptable mounting system increases mount strength by 41 percent while expanding compatibility. The one-piece design preserves alignment between receiver and optic for reliable, repeatable zero. Among 20-MOA scope bases for the Browning A-Bolt short action, this Mark 4 configuration is built for precision and competition setups.

Key Specifications

• The base uses a one-piece design, giving consistent alignment and rigidity for repeatable optic zero.
• The elevation offset is 20 MOA, allowing additional elevation for long-range and precision shooting.
• The mounting hardware is 8-40 adaptable, providing increased mount strength and wider compatibility.
• The base can accommodate both 8-40 screws and a modified 6-48 shoulder screw, offering flexible attachment options.
• The construction is steel, delivering the rigidity needed to support optics under typical recoil forces.
• The finish is matte black, which minimizes reflections during bright-light use.
• The adaptable 8-40 screw pattern increases mount strength by 41 percent, improving robustness for sustained use.

Frequently Asked Questions

What does the 8-40 adaptable pattern offer over a fixed screw pattern? Increased mount strength — 41 percent stronger — while expanding compatibility across receivers that use slightly different hardware.

Why 20 MOA on this base? It’s built for long-range hunting and precision shooting where the standard elevation offset isn’t enough to reach extended distances.

Buy the Leupold Mark 4 Base, A-Bolt SA, 20 MOA

Long-range work on an A-Bolt short action calls for both elevation and a reinforced mounting pattern, and this Mark 4 base delivers both. Order it from our Lubbock, Texas gun shop and it ships fast.