Colt 6721 AR-15 A3 HBAR Rifle Review (HD)

Published on January 18, 2014
Duration: 7:28

This expert-level review of the Colt 6721 AR-15 A3 HBAR Rifle, presented by Mrgunsngear, details its technical specifications, accuracy performance, and compares it to the popular Colt 6920. The analysis highlights the benefits of the heavy barrel profile for heat management and accuracy, along with the rifle's reliable components and overall quality.

Quick Summary

The Colt 6721 AR-15 A3 HBAR Rifle features a 16-inch heavy barrel with a 1:9 twist rate, optimized for stabilizing 50-62 grain bullets. Accuracy testing showed it capable of sub-MOA performance with appropriate ammunition, and its heavy barrel offers better heat management during rapid fire.

Chapters

  1. 00:34Introduction to Colt 6721 Rifle
  2. 01:05Accuracy Testing Setup & Methodology
  3. 02:13Accuracy Test Results & Analysis
  4. 02:46Colt 6721 Barrel & Front Sight
  5. 03:12Handguard, Rear Sight & Upper Receiver
  6. 03:45Bolt Carrier Group & Lower Receiver
  7. 04:14Receiver Extension, Stock & Grip
  8. 04:37Buffer System & Heavy Barrel Rationale
  9. 05:12Weight & Heat Management of Heavy Barrel
  10. 05:46Overall Assessment & 6920 Comparison
  11. 06:16Conclusion & Viewer Engagement

Frequently Asked Questions

What are the key advantages of the Colt 6721's heavy barrel profile?

The heavy barrel on the Colt 6721 heats up less quickly during rapid fire, which helps maintain tighter accuracy groups. It also offers improved durability and heat dissipation compared to lighter barrel profiles.

What is the recommended twist rate for the Colt 6721, and what ammunition does it stabilize best?

The Colt 6721 features a 1:9 twist rate, which is optimal for stabilizing common bullet weights between 50 and 62 grains. This makes it a versatile choice for various types of lighter ammunition.

How does the Colt 6721's accuracy compare to other AR-15 models?

When tested with suitable ammunition like Lehi Defense, the Colt 6721 demonstrated accuracy close to 1 MOA at 100 meters, positioning it as a highly accurate platform, comparable to or exceeding many standard AR-15s.

What are the notable features of the Colt 6721's bolt carrier group (BCG)?

The Colt 6721 is equipped with a standard Colt full-auto profile BCG, featuring a full-auto cut and excellent staking for durability. The bolt itself is made from 158 Carpenter steel, tested for strength and reliability.

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