How to Cut a Sight Dovetail by Hand Presented by Larry Potterfield | MidwayUSA Gunsmithing

Published on April 30, 2009
Duration: 1:31

This video demonstrates the precise hand-filing technique for cutting a sight dovetail, specifically for a Beech front sight on an octagon barrel for a Custer's Rolling Block rifle replica. It details the layout process using Dyken Steel Blue and a scribe, the initial cutting to a 0.090-inch depth with a standard file, and the crucial use of a safe-edge dovetail file for undercuts. The final steps involve fitting the sight and using a brass punch and hammer to seat it properly.

Quick Summary

To cut a sight dovetail by hand, start by marking the location with layout fluid and a scribe. File to a standard depth of 0.090 inches, then use a safe-edge dovetail file for precise undercuts. Finally, fit the sight, ensuring it's snug before seating it with a brass punch and hammer.

Chapters

  1. 00:00Introduction: Custer's Rolling Block Rifle Project
  2. 00:17Layout and Marking the Dovetail
  3. 00:25Initial Dovetail Cutting with a File
  4. 00:38Filing Undercuts with a Safe-Edge File
  5. 00:58Fitting and Installing the Front Sight

Frequently Asked Questions

What is the standard depth for cutting a sight dovetail by hand?

The standard depth for cutting a sight dovetail by hand is typically 0.090 inches. This depth is crucial for ensuring the sight is securely seated and properly aligned on the firearm barrel.

What type of file is best for cutting dovetail undercuts?

A specialized safe-edge dovetail file is recommended for cutting the undercuts. This type of file only cuts on its sides, preventing the widening of the main slot while allowing precise angle formation.

How do you properly fit a front sight into a newly cut dovetail?

The sight should be snug enough to push halfway in by hand. Use a brass punch and hammer to gently drive it the rest of the way, ensuring it's fully seated without damaging the sight or barrel.

What materials are needed for marking a dovetail location?

You'll need layout fluid, such as Dyken Steel Blue, applied to the barrel surface. A scribe is then used to mark the precise lines for the dovetail cut onto the fluid-coated area.

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