The Perpetual Agony of the AR-9

Published on November 4, 2021
Duration: 6:33

This AR-9 build faced significant reliability issues, particularly with ASC and C-Products magazines when loaded with an even number of rounds. The problem was traced to the feed lip geometry interfering with the last-round bolt hold-open lever. While upgrades like a longer barrel and better brace improved handling, the inherent blowback action remains jarring. Potential fixes include a new bolt carrier group or retiring the build.

Quick Summary

AR-9 reliability issues are often caused by magazine feed lip geometry, particularly with ASC and C-Products mags, which can interfere with the bolt hold-open. Metalform magazines, the OEM for Colt, typically do not have this problem due to their seating height.

Chapters

  1. 00:00Intro: Colt Mag AR-9 Pistol Issues
  2. 01:12Upgrade Process: New Barrel & Brace
  3. 02:08Shooting Performance: Blowback Action
  4. 02:44Magazine Reliability Deep Dive
  5. 04:18Technical Analysis: Feed Lip Geometry
  6. 06:10Conclusion & Future Plans

Frequently Asked Questions

What causes reliability issues in some AR-9 builds, particularly with ASC magazines?

Reliability issues in AR-9s, especially with ASC and C-Products magazines, often stem from the feed lip geometry. When loaded with an even number of rounds, the feed lips can interfere with the last-round bolt hold-open lever, preventing proper cycling.

Are Metalform magazines a reliable alternative for AR-9 builds experiencing issues?

Yes, Metalform magazines are generally considered reliable for AR-9s. They are the OEM for original Colt 9mm magazines and feature a feed lip geometry that avoids the interference issues seen with ASC and C-Products mags.

How does the blowback action of an AR-9 compare to other PCCs?

The blowback action inherent in most AR-9 platforms can feel 'jarring' and 'violent' during operation compared to other pistol caliber carbines that might use different operating systems, like the roller-delayed blowback of the PTR 9CT.

What are potential solutions for persistent 'out of battery' issues in an AR-9 build?

If magazine and buffer components are ruled out, persistent 'out of battery' issues might require a different bolt carrier group. A Spinta Precision BCG is mentioned as a potential upgrade to address these specific malfunctions.

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