Custom Krieger AR-15 Barrel Tested: Groups, Inspection, Borescope

Published on January 16, 2026
Duration: 16:45

This comprehensive review details the testing of a custom Krieger AR-15 barrel finished by Ross Precision Machine. Preston Moore, demonstrating high authority and an analytical tone, provides detailed borescope inspections, weight measurements, and extensive ballistic data. The barrel exhibits exceptional accuracy and velocity with match-grade ammunition, ranking highly against competitors. The review emphasizes the importance of proper break-in procedures and precise manufacturing tolerances for optimal performance.

Quick Summary

The custom Krieger AR-15 barrel (16", 1:7 twist, 416R Stainless) demonstrated exceptional performance, achieving 0.9-1.0 MOA with 77gr match ammo and high velocities up to 3247 FPS with M193. Borescope inspection revealed high quality, with minor throat smearing resolving after break-in.

Chapters

  1. 00:00Introduction: Custom Krieger AR-15 Barrel
  2. 00:21Technical Specifications: 416R Stainless, 1:7 Twist
  3. 00:50Weight & Headspace Verification
  4. 01:40Gas Port & Journal Measurements
  5. 02:15Borescope Inspection: Chamber & Rifling
  6. 03:59Break-in Procedure & Rifle Setup
  7. 05:14IMI Razor Core 77gr HPBT Testing & Results
  8. 09:06A-ZED Metric Explained
  9. 11:14Federal Gold Medal 77gr SMK Testing
  10. 14:00Winchester M193 55gr Testing & Velocity
  11. 16:11Conclusion & Future Testing

Frequently Asked Questions

What are the key technical specifications of the custom Krieger AR-15 barrel tested?

The barrel is 16 inches long, made from 416R Stainless Steel, features a 1:7 twist rate with 4-groove rifling, an intermediate gas system, 5/8x24 muzzle threads, and a straight 0.750-inch gas block profile. It has a custom chamber optimized for 77gr Sierra MatchKings.

How did the Krieger barrel perform with different types of ammunition?

It excelled with match ammunition like IMI Razor Core 77gr HPBT and Federal Gold Medal 77gr SMK, producing excellent groups (0.9-1.0 MOA) and high velocities. With bulk Winchester M193 55gr, it achieved a high velocity of 3247 FPS.

What was the result of the borescope inspection on the Krieger barrel?

The borescope revealed a high-quality finish in the chamber and rifling. Some minor reamer smearing was noted in the throat before break-in, which smoothed out after firing, indicating a need for proper break-in procedures.

What tools and metrics were used in the testing of the Krieger AR-15 barrel?

Testing involved a Teslong borescope for internal inspection, a Garmin Xero C1 Pro chronograph for velocity, and sensors like the Shooters Global SG Pulse and Mantis X10 Elite. The A-Zone Equivalence Distance (A-ZED) metric was used to assess practical accuracy.

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