Anvil 087: Sharps Borchardt .45/120

Published on September 10, 2020
Duration: 22:26

This video details the precision gunsmithing required to install a front sight and reproduction Malcolm scope on a Sharps Borchardt .45/120 rifle. Mark Novak demonstrates complex dovetail cutting on an octagonal barrel, emphasizing meticulous measurements and machining techniques. The process involves careful material removal, precise cutter angles, and specialized tapping methods for sight mounting, highlighting the challenges of working with large-bore antique firearms.

Quick Summary

Installing sights on a Sharps Borchardt .45/120 involves precision dovetail cutting on the barrel. This complex process requires careful measurement and machining, often using a two-step method with straight and angled cutters. Reliable open sights are crucial for this caliber due to its extreme trajectory.

Chapters

  1. 00:00Intro: Sharps Borchardt .45/120 & Scope Install
  2. 00:55Sight Placement Theory for Big Bore Rifles
  3. 03:22Dovetail Machining Explained
  4. 07:06Machining the Barrel: Dovetail Cut
  5. 13:09Mounting Sights & Gunsmithing Tricks
  6. 18:14Range Test: .45/120 Recoil & Cartridge Scale

Frequently Asked Questions

What is involved in installing sights on a Sharps Borchardt .45/120?

Installing sights on a Sharps Borchardt .45/120 typically involves precision machining, specifically cutting a dovetail slot into the barrel. This requires careful measurement and execution to ensure the sight is securely mounted and properly aligned for accurate shooting.

Why are open sights important for the .45/120 caliber?

The .45/120 caliber fires heavy bullets with a significant arc, resulting in an extreme trajectory. Reproduction scopes often have limited adjustment, making reliable open sights essential for compensating for this 'rainbow' trajectory and achieving accuracy.

What are the key steps in cutting a dovetail for a firearm sight?

Cutting a dovetail involves a two-step machining process. First, a straight mill removes the bulk of the material. Then, a specialized 60-degree dovetail cutter is used to create the angled slots, requiring precise depth and width measurements to fit the sight base.

What gunsmithing trick can be used for securing sight threads?

A common gunsmithing trick is to use an 8-36 tap for an 8-40 screw. This creates a slightly smaller thread diameter, resulting in an interference fit that acts as a permanent thread locker, ensuring the sight stays securely in place.

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