Weaver Top-Mount Base #20A glossy black for Mossberg 400 and others.

Weaver Top-Mount Base #20A glossy black for Mossberg 400 and others.
Each Weaver base is machined for a custom fit with the tightest tolerances. They are designed to counteract the effects of recoil with a square notch that precisely fits the stable cross pin in each removable Weaver ring. Fits:

Interarms Mark X (Front)
Mossberg 400 (Rear)
Remington Models 14 & 141 (Rear)
Western Field 770 (Front)
Winchester Models 05, 07, & 10 (Rear)

This is a 1-piece base of a 2-piece system.
Mounting material included