Colt 9mm AR15 carbine and its predecessor

Published on June 1, 2018
Duration: 26:41

This review compares the Colt 9mm AR15 SBR with an older Olympic Arms 9mm conversion. It details the direct blowback operation of the Colt, its Uzi-based magazines, and the challenges of loading. The Olympic Arms conversion, using Sten magazines, is shown to have feeding issues and design quirks, highlighting the evolution of pistol-caliber carbines.

Quick Summary

The Colt 9mm AR15 carbine uses a direct blowback system without a gas tube, featuring a heavy bolt for inertia cycling. Its magazines are Uzi-based with unique cuts, and ASC variants often offer better reliability than original Colt magazines.

Chapters

  1. 00:00Introduction: Colt 9mm AR15 SBR
  2. 01:30Magazine Design & Reliability (Colt vs. ASC)
  3. 02:20Direct Blowback Operation Explained
  4. 03:55Colt 9mm Shooting Test (50 Yards)
  5. 05:55Internal Components & Bolt Design
  6. 09:45Magazine Loading Tips (UpLULA)
  7. 13:43Olympic Arms 9mm Conversion Intro
  8. 16:55Olympic Arms Shooting Issues
  9. 19:28Colt vs. Olympic Arms: Internal Differences

Frequently Asked Questions

What is the operating system of the Colt 9mm AR15 carbine?

The Colt 9mm AR15 carbine operates on a direct blowback system. This means it does not use a gas tube like standard 5.56 AR15s; instead, the bolt is heavy and cycles purely through inertia.

How do Colt 9mm magazines differ from standard AR15 magazines?

Colt 9mm magazines are based on the Uzi design but feature a different locking cut. They are not interchangeable with standard 5.56 AR15 magazines and require a specific magazine block in the lower receiver.

What are the potential issues with older 9mm AR15 conversions like the Olympic Arms model?

Older conversions, such as the Olympic Arms using Sten magazines, can suffer from magazine over-insertion and feeding failures. Sten magazines lack an over-insertion stop, requiring careful manual adjustment.

Is the recoil of a 9mm AR15 different from a 5.56 AR15?

Yes, the 9mm AR15 typically has a more abrupt recoil impulse due to its direct blowback system and heavy bolt. This can make it slightly less controllable during rapid fire compared to a gas-operated 5.56 rifle.

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