How to Pin & Weld

Published on February 1, 2019
Duration: 10:47

This guide details the process of pinning and welding a muzzle device to an SKS rifle to legally extend the barrel length from 14.5 inches to 16.5 inches. The expert instruction covers precise drilling techniques, TIG welding parameters, and finishing methods for a professional result. The video demonstrates advanced gunsmithing skills necessary for this permanent firearm modification.

Quick Summary

Pinning and welding a muzzle device permanently attaches it to a barrel, often to extend the length to the legal 16-inch minimum for rifles, avoiding SBR classification. The process involves precise drilling, TIG welding a pin, and refinishing, as demonstrated by Iraqveteran8888 on an SKS rifle.

Chapters

  1. 00:00Project Overview: SKS Pin and Weld
  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 Process
  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 technique used to permanently attach it to a firearm barrel. This method is commonly employed to extend the barrel's overall length to meet legal requirements, such as the 16-inch minimum for rifles, thereby avoiding classification as a Short-Barreled Rifle (SBR).

What tools are essential for pinning and welding a muzzle device?

Essential tools include a vise (bench and drill press), appropriate drill bits (e.g., 1/8 inch), a pin material (like drill rod), a TIG welder with a 3/32 inch tungsten, degreasing supplies (Scotch-Brite), and a cold bluing solution (like 44-40 Instant Gun Blue) for finishing.

How do you ensure a flush finish when pinning and welding?

A flush finish is achieved through precise preparation. This involves drilling a dimple into the barrel threads and chamfering it to create a recess for the weld puddle. The pin is then carefully welded to be level with the barrel surface, followed by finishing to match the original blueing.

What are the key steps in the pin and weld process?

The process involves securing the barrel, drilling the muzzle device and barrel for a pin, preparing the pin, inserting it, TIG welding it in place, and finally cleaning and refinishing the area to match the original appearance. Careful depth control during drilling is critical.

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