STD Browning AB3 2pc Scope Base Matte by Leupold Optics offers the STD Browning AB3 2pc Scope Base Matte. The STD bases are forged and machined from high quality steel and finished to a beautiful sheen. The mounts are designed by Leupold to fit the Browning AB3 rifle. Leupold STD mounts are windage adjustable via two slotted screws on the rear mount. Specifications and Features: Windage Adjustable Forged Steel Expert Finish Two Peice