Testing a Colt SOCOM AR-15 Barrel (Groups, Borescope, Headspace, etc)

Published on August 7, 2025
Duration: 13:03

This comprehensive guide details the expert-level inspection and testing of a Colt SOCOM AR-15 barrel, as demonstrated by Preston Moore. It covers detailed physical inspections using precision tools like micrometers and borescopes, followed by rigorous range testing with a structured 30-shot methodology. The analysis includes group sizes, velocities, and comparisons between different ammunition types, offering valuable insights for AR-15 owners and enthusiasts.

Quick Summary

Expert Preston Moore tested a Colt SOCOM 14.5" AR-15 barrel, detailing its 4150 CMV steel construction, chrome lining, and 1:7 twist rate. Rigorous inspection included borescope analysis and headspace gauging. Range tests with IMI Razor Core 77gr HPBT yielded 2.877 MOA groups, demonstrating solid accuracy potential for this barrel profile.

Chapters

  1. 00:00Introduction and Overview
  2. 00:24Technical Specifications
  3. 00:43Physical Inspection and Gauging
  4. 01:52Borescope Inspection
  5. 03:20Shooting Setup and Methodology
  6. 04:52Range Testing: IMI Razor Core
  7. 07:31Range Testing: AAC 77gr OTM
  8. 09:50Range Testing: Winchester M193
  9. 11:57Final Results Summary

Frequently Asked Questions

What are the key specifications of the Colt SOCOM AR-15 barrel tested?

The tested Colt SOCOM 14.5" barrel is constructed from 4150 chrome moly vanadium steel, features a chrome-lined chamber and bore, a carbine-length gas system, 5.56 NATO chamber, 1:7 twist rate, 0.750" gas block journal, and 1/2x28 threads. It weighs 1.89 lbs and includes a front sight base.

How did the Colt SOCOM barrel perform in accuracy testing with different ammunition?

In 30-shot group tests at 100 yards, the Colt SOCOM barrel achieved its best precision with IMI Razor Core 77gr HPBT (2.877 MOA), followed by Winchester M193 55gr FMJ (4.116 MOA), and AAC 77gr OTM (4.038 MOA). The IMI load resulted in the highest A-ZED score of 187 yards.

What tools were used for the detailed inspection of the Colt SOCOM barrel?

The inspection utilized a Teslong borescope for internal views, Rexbeti micrometers for precise diameter measurements of the barrel extension and gas block journal, and standard headspace gauges (Min, No-Go, Field) to ensure proper chamber fitment.

What was the overall assessment of the Colt SOCOM barrel's quality based on the video?

The barrel passed critical gauging tests and showed acceptable internal conditions via borescope, despite minor cosmetic imperfections in the throat. Its performance with specific ammunition, particularly the IMI Razor Core, indicates good accuracy potential for its intended SOCOM profile.

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