The Weaver #19 Top-Mount Scope Base (Weaver part no. 48019) is machined specifically for the Winchester Model 1903, giving this classic rimfire a factory-tight platform for a riflescope. Weaver cuts the base from aluminum and finishes it in a black gloss that matches the 1903’s factory blued receiver. Because it’s machined to the exact screw pattern of this rifle, it bolts straight to the factory holes with no drilling or gunsmithing needed. This is the correct base to start with if you’re mounting glass on a Winchester 1903 for plinking or small-game hunting.

Key Specifications

• Purpose-built to fit the Winchester Model 1903, matching the receiver’s factory-drilled screw pattern.
• Listed as a 1-piece base, so a single component bridges the full mounting area.
• Uses Weaver’s To Receiver mount style, bolting directly to the factory tapped holes.
• Finished in black gloss to match the 1903’s factory blued receiver.
• Machined from aluminum for a lightweight, corrosion-resistant base.
• Requires Weaver-style rings to complete the mount.
• Ships with rings not included, so pair it with your own Weaver-style rings.
• Cross-references as Weaver Application #19 on the brand’s official fit chart.
• Ships at a featherlight 0.0188 lb, adding almost nothing to your order.

Frequently Asked Questions

What rifle does this base fit? It’s machined specifically for the Winchester Model 1903, listed under Weaver’s Application #19.

Are scope rings included? No, this is the base only; pair it with a set of Weaver-style rings to finish the mount.

Does it require any gunsmithing to install? No, it bolts directly to the 1903’s factory screw holes.

Buy the Weaver #19 Top-Mount Scope Base for Winchester Model 1903

A vintage rimfire deserves a base that bolts on clean without altering the receiver, and this Weaver #19 is machined to the 1903’s exact factory pattern. Order it from our Lubbock, Texas gun shop and it ships fast to your door, along with more scope bases and mounting hardware.