My First AR-9 Pistol Build With A FM Products Upper, CMT Lower, & SBA3 Brace

Published on March 22, 2019
Duration: 19:36

This video details the build process of a custom AR-9 pistol, highlighting the FM Products side-charging upper and CMT billet lower. The presenter, Mrgunsngear, provides insights into component selection, assembly, accuracy testing with various ammunition types, and overall performance impressions. The build emphasizes modularity and common AR-15 platform compatibility while addressing specific AR-9 considerations like bolt compatibility and magazine choices.

Quick Summary

This custom AR-9 pistol build features an FM Products 8.5-inch side-charging upper and a CMT billet lower, achieving sub-MOA accuracy at 50 yards with 147-grain ammunition. Advantages include lower ammo costs, portability, and a softer shooting experience, making it suitable for new shooters and recoil-sensitive individuals.

Chapters

  1. 00:35Introduction to the AR-9 Pistol Build
  2. 00:50Component Selection: FM Products Upper & CMT Lower
  3. 01:14Additional Components: Grip, Brace, Lower Parts
  4. 01:24Accuracy Testing: Range Session Setup
  5. 01:31Ammunition Testing: Minuteman Munitions 125gr
  6. 02:27Ammunition Testing: Hornady Critical Duty 135gr
  7. 02:59Ammunition Testing: Speer Gold Dot G2 147gr
  8. 03:22Accuracy Results Analysis
  9. 04:21Upper Receiver Breakdown: FM Products
  10. 04:39Side Charging Handle and Barrel Specs
  11. 05:15Thread Pitch and Suppressor Compatibility
  12. 05:39Barrel Material and Handguard Details
  13. 06:09Bolt Carrier Group and Blowback System
  14. 06:54Trigger Compatibility and Weight
  15. 07:35Forward Assist and Feed Ramp Design
  16. 07:57Why Choose an AR-9 Pistol?
  17. 08:53Lower Receiver Breakdown: CMT Billet
  18. 09:02Last Round Bolt Hold-Open Status
  19. 09:23Magazine Release and Bolt Catch
  20. 09:53Receiver Tensioning Screw
  21. 10:05Integrated Trigger Guard and Weight Reduction
  22. 10:22Buffer Tube Reinforcement
  23. 10:41Buffer and Spring Selection
  24. 11:15Grip and Brace Installation
  25. 11:55Sling Mount and Brace Functionality
  26. 12:08Reliability and Cost Analysis
  27. 12:14Malfunction with ETS Magazines
  28. 12:51Estimated Build Cost
  29. 13:50Overall Impressions: Side Charging Handle
  30. 14:48Shooting Impressions: Soft Recoil
  31. 15:07Muzzle Blast and Blast Can
  32. 15:32Flash Hider Upgrade
  33. 15:50Future Plans: FM Products Lower
  34. 16:16Q&A and Call to Action

Frequently Asked Questions

What are the key components of this custom AR-9 pistol build?

The build features an FM Products 8.5-inch 9mm side-charging upper receiver and a CMT billet lower receiver. It's equipped with an SB Tactical SBA3 adjustable brace, a Magpul grip, and a BCM lower parts kit. The presenter also used various ammunition types for testing.

How accurate is this AR-9 pistol build?

During accuracy testing at 50 yards, the AR-9 pistol achieved impressive results, with the best group measuring approximately half an inch center-to-center using 147-grain Speer Gold Dot G2 ammunition, equating to sub-MOA performance.

What are the advantages of building an AR-9 pistol?

AR-9 pistols offer advantages such as lower ammunition costs for reloaders, a softer shooting experience compared to rifle calibers, and excellent portability. They are also easier to travel with than SBRs and can be a good option for recoil-sensitive shooters.

What are the considerations for AR-9 magazines and bolts?

The FM Products upper's bolt is compatible with Colt and Glock magazines. However, it's recommended to use factory Glock magazines for maximum reliability when using Glock-pattern magazines. A Glock bolt may not be compatible with Colt magazines.

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