4" AR Noise Maker

Published on October 30, 2024
Duration: 7:12

This review covers a 4-inch Bear Creek Arsenal AR-15 upper assembly chambered in 5.56x45mm NATO. While acknowledged as a novelty and 'noise maker' with significant muzzle flash, the reviewer highlights critical quality control issues with the specific unit received, including a dirty chamber and weak extractor. Despite these flaws, the reviewer notes that once corrected with an O-ring and chamber cleaning, the upper functioned reliably on an SPR lower.

Quick Summary

A 4-inch AR-15 upper in 5.56x45mm NATO is primarily a novelty, producing significant noise and a large fireball due to unburnt powder. While functional after resolving quality control issues like dirty chambers and weak extractors, it lacks practical application and requires more frequent cleaning.

Chapters

  1. 01:10Introduction: Micro AR-15
  2. 01:36Sponsor Shoutout: A-A-C-O Ammunition
  3. 02:10Review: 4-inch Upper Assembly
  4. 02:15Practicality and Novelty
  5. 03:03Functionality Out of the Box
  6. 03:30Quality Control Issues: Chamber & Extractor
  7. 04:24Fixing QC Issues: O-ring & Cleaning
  8. 05:02Unburnt Powder and Maintenance
  9. 05:44Technical Specifications: Barrel & Threads
  10. 06:01Range Performance and Lower Compatibility
  11. 06:23BCA Quality Control Concerns
  12. 06:46Value Proposition and Recommendation
  13. 07:07Conclusion

Frequently Asked Questions

What are the main drawbacks of a 4-inch AR-15 chambered in 5.56x45mm NATO?

A 4-inch barrel in 5.56x45mm NATO significantly reduces projectile velocity and results in substantial unburnt powder exiting the muzzle. This creates a large fireball and extreme noise, making it impractical for most applications beyond novelty.

What quality control issues were found on the Bear Creek Arsenal 4-inch AR upper?

The reviewer encountered a dirty chamber that caused rounds to stick and a weak extractor spring. These issues are attributed to poor quality control from Bear Creek Arsenal, preventing reliable function out of the box.

How can the quality control issues on a short-barreled AR upper be mitigated?

The reviewer fixed the issues by thoroughly cleaning and polishing the chamber and adding an O-ring to the extractor. This O-ring helps manage the increased fouling from unburnt powder common in very short barrels.

Is a 4-inch AR-15 upper assembly practical for any real-world use?

The reviewer explicitly states that a 4-inch 5.56 AR upper is a complete novelty with no practical application. Its primary function is as a 'noise maker' and 'flamethrower' for entertainment purposes at the range.

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