How to Install an AR-15 Barrel Presented by Larry Potterfield of MidwayUSA

Published on July 19, 2018
Duration: 5:23

This guide details the AR-15 barrel installation process, emphasizing critical steps like applying anti-seize to threads and proper torque application. It covers aligning the barrel's indexing stud, hand-tightening the barrel nut, and achieving the correct torque range of 30-80 ft-lbs. The video also demonstrates the 'seasoning' of threads and the importance of gas tube alignment for proper function.

Quick Summary

The correct torque range for an AR-15 barrel nut is 30-80 ft-lbs. Before final tightening, it's recommended to 'season' the threads by repeatedly tightening to 30 ft-lbs and loosening. Always apply anti-seize compound to prevent galling.

Chapters

  1. 00:00Introduction and Tools for AR-15 Barrel Installation
  2. 00:13Applying Anti-Seize to Barrel Threads
  3. 00:33Indexing Barrel and Hand Tightening Barrel Nut
  4. 01:12Achieving Correct Torque Specifications (30-80 ft-lbs)
  5. 01:51Mating Threads: The 'Seasoning' Process
  6. 02:46Aligning Delta Ring for Gas Tube Installation
  7. 03:29Checking Gas Tube Alignment with Gauge
  8. 04:08Installing the Gas Tube and Roll Pin
  9. 04:59Final Function Check of AR-15 Build

Frequently Asked Questions

What is the correct torque range for an AR-15 barrel nut?

The proper torque range for an AR-15 barrel nut is between 30 and 80 ft-lbs. It's recommended to tighten to 30 lbs, loosen, and repeat this process multiple times to properly mate the threads before final tightening.

Why is applying anti-seize important during AR-15 barrel installation?

Applying anti-seize compound liberally to the threads of both the barrel nut and the receiver is critical. This prevents galling, ensuring the components can be properly tightened and later disassembled without damage.

How do you ensure the gas tube is correctly aligned during AR-15 barrel installation?

After installing the barrel nut, use a gas tube alignment gauge to check that the tube enters the receiver freely without touching the nut. The barrel nut must be positioned correctly to allow this clearance.

What are the essential tools needed for installing an AR-15 barrel?

Essential tools include a sturdy vise, a specialized AR-15 receiver holding fixture, a barrel nut wrench, and a torque wrench. You'll also need anti-seize compound and potentially punches for roll pins.

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