Sporterizing the Mosin Nagant Part 8- Drilling and Tapping for the Rock Solid Mount

Published on December 19, 2010
Duration: 10:48

This guide details the advanced gunsmithing process of drilling and tapping a Mosin Nagant receiver for a Rock Solid scope mount. Expert instruction covers precise measurements, correct tool usage, and essential techniques like chip breaking to ensure a secure and accurate scope installation. The video emphasizes meticulous work for a successful sporterization project.

Quick Summary

Drilling and tapping a Mosin Nagant for a scope mount requires precision. Use a #21 drill bit and cutting oil, followed by a 10-32 tap, backing it off every eighth turn for chip breaking. Measure depth carefully with dial calipers, especially over the chamber, to ensure safety and proper alignment.

Chapters

  1. 00:00Introduction to Drilling Jig
  2. 00:47Drilling the First Hole
  3. 02:31Tapping the First Hole
  4. 03:38Setting Up the Second Hole
  5. 06:11Precision Depth Measurement
  6. 08:58Deburring and Chamfering
  7. 09:50Bore Sighting

Frequently Asked Questions

What is the correct drill bit size for tapping a 10-32 hole in a Mosin Nagant receiver?

For a 10-32 tap, the recommended drill bit size is typically a #21. Using a quality drill bit and cutting oil is essential to prevent wear and ensure clean threads during the tapping process.

Why is it important to use a drilling jig when modifying a Mosin Nagant receiver?

A drilling jig, like the Forster Products model shown, ensures precise alignment and straight holes, which are critical for securely mounting a scope. This prevents misalignment that could lead to accuracy issues or mount failure.

What is the purpose of backing off the tap every eighth turn when threading a rifle receiver?

Backing off the tap every eighth turn is a crucial chip-breaking technique. It fractures the metal shavings (chips) into smaller pieces, preventing them from binding the tap, breaking the tap, or creating a poor-quality thread.

How can one ensure accurate drill depth when tapping holes over the chamber of a Mosin Nagant?

Precision measuring tools like Starrett dial calipers are used to measure receiver wall thickness and distances. This data determines the exact drilling depth needed to avoid compromising the receiver's integrity near the chamber.

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