Weaver Top-Mount Base #401 black for Smith & Wesson and others.

Weaver Top-Mount Base #401 black for Smith & Wesson 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:

Smith & Wesson Models 29, 629, 625, L, K & N Frame Revolvers (Factory Drilled)
Taurus L, K & N Frame Revolvers (Like S&W, Factory Drilled)

This is a 1-piece base.
Mounting hardware included.