Weaver 63BS Top Mount Scope Base – Silver, Marlin 336/Mossberg 640

Add glass to your Marlin lever gun or Mossberg 640 without sending the rifle to a gunsmith. The Weaver 63BS top mount base bolts straight to the receiver and gives you an immediate, secure platform for a set of Weaver detachable rings, whether you're topping off a deer rifle or a truck gun.

This one-piece base is machined from aluminum to tight tolerances for a custom fit, and it uses Weaver's cross-lock design, a square-cut notch that mates directly to the cross bolt in every Weaver detachable ring for a rock-solid hold under recoil. It mounts straight to the receiver in silver to match factory finishes, and custom-hardened fastening screws are included so you have everything needed to install it.

Key Specifications

• Product Type: 1-Piece Base
• Mount Type: To Receiver
• Finish: Silver
• Material: Aluminum
• Ring Compatibility: Weaver detachable cross-lock rings
• Hardware: Custom-hardened fastening screws included
• Fits: Marlin 45, 30AS, 336 (all models), 444, 1893, 1894, 1895, Camp-9, 922M, 989, .22 Auto, Western Field 740, Mossberg 640

Marlin and Mossberg 640 owners who want a scope up top without machining or gunsmithing will get exactly that with this drop-on fit, and this Weaver 63BS Top Mount Base is for sale at Loftus Firearms.