Ensure steadfast support for your optics or accessories with the aluminum Weaver Top Mount Base #63B. Designed to be compatible with Weaver rings, this versatile base can be utilized as either a front or rear base on select firearms.

Single-Piece Base Compatibility:

• Marlin 45, 30AS, 336, 444, 1894, 1895, Camp 9, 308, 338, 1895
• Western Field 740
• Mossberg 640