How to Pin & Weld

Published on February 1, 2019
Duration: 10:47

This video details the process of pinning and welding a muzzle device to an SKS rifle barrel to achieve a legal 16.5-inch length from a 14.5-inch base. It covers precise drilling of the muzzle device and barrel, pin preparation, TIG welding techniques, and finishing the weld for a seamless appearance. The expert demonstrates advanced gunsmithing skills, including setting drill depth and timing the muzzle brake without a crush washer.

Quick Summary

Pinning and welding a muzzle device permanently attaches it to a rifle barrel, often to extend its length to meet legal requirements like the 16-inch minimum. The process involves drilling the muzzle device and barrel, preparing a pin, TIG welding it in place, and finishing the weld for a seamless look.

Chapters

  1. 00:00Project Overview: SKS Barrel Extension
  2. 01:31Drilling the Muzzle Brake
  3. 02:37Setting Depth and Timing
  4. 04:16Drilling the Barrel Dimple
  5. 05:36Pin Preparation
  6. 08:06TIG Welding the Pin
  7. 09:27Finishing and Cleanup

Frequently Asked Questions

What is the purpose of pinning and welding a muzzle device?

Pinning and welding a muzzle device is a gunsmithing method used to permanently attach it to a rifle barrel. This is often done to extend the barrel's overall length to meet legal requirements, such as making a rifle with a barrel shorter than 16 inches compliant with NFA regulations.

How do you ensure the pin is properly seated for welding?

The pin should be prepared by profiling its tip to match the drill bit's point (typically 135 degrees). This ensures maximum contact at the bottom of the drilled hole in the barrel and muzzle device, creating a secure foundation for the weld.

What is the correct amperage for TIG welding a muzzle device pin?

For pinning muzzle devices on rifle barrels, TIG welding at approximately 60 amps is recommended. This amperage, combined with a 3/32 tungsten electrode, provides sufficient heat for a strong weld without excessive penetration that could damage the barrel.

How can I achieve a flush finish after pinning and welding?

To achieve a flush finish, first drill a dimple into the barrel threads and chamfer it to create a recess for the weld puddle. After welding, clean the area and use a cold blue product like 44-40 Instant Gun Blue to match the surrounding barrel finish.

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