Foxtrot Mike FM-9B Enhanced AR-9 Review

Published on July 6, 2021
Duration: 20:08

This review of the Foxtrot Mike FM-9B, a Brownells exclusive AR-9 pistol caliber carbine, details its features and performance. The firearm utilizes a blowback operating system and includes a last-round bolt hold-open, flared magwell, and an MLOK handguard. Accuracy testing at 50 yards showed variable results depending on ammunition, with Federal HST performing best. The reviewer highlights the robust construction, particularly the upper receiver's dovetail interface and the bolt carrier group's reliability features, while noting the non-threaded barrel as a potential drawback for suppressor use.

Quick Summary

The Foxtrot Mike FM-9B is a Brownells exclusive AR-9 pistol caliber carbine featuring a 5-inch barrel, blowback operation, and a robust build with a solid dovetail handguard interface. It includes a last-round bolt hold-open and flared magwell for enhanced reliability and ergonomics. Accuracy testing showed best performance with Federal HST 124gr +P ammunition, achieving groups around 1.75 inches at 50 yards.

Chapters

  1. 00:43Introduction: Foxtrot Mike FM-9B
  2. 01:08Range Test: Accuracy at 50 Yards
  3. 02:34Accuracy Results: Red Army Standard
  4. 02:41Accuracy Results: Minuteman Ammunition
  5. 03:08Accuracy Results: Federal HST +P
  6. 04:27Accuracy Analysis: Muzzle Device Impact
  7. 05:14Firearm Features: Flash Can & Barrel
  8. 06:21Handguard and Upper Receiver Design
  9. 07:15Disassembly and Upper/Lower Receiver
  10. 08:18Barrel Feed Ramp and Bolt Carrier Group
  11. 09:53Lower Receiver Features: Mag Release & Bolt Hold Open
  12. 10:53Trigger and Buffer Assembly
  13. 12:31Receiver Extension and Brace
  14. 13:23Price Point and Availability
  15. 14:15Reliability Testing: 800 Rounds
  16. 15:03Overall Thoughts and Recommendations
  17. 16:01Safety Considerations: Short Barrels
  18. 17:08Value and Conclusion

Frequently Asked Questions

What are the key features of the Foxtrot Mike FM-9B AR-9?

The Foxtrot Mike FM-9B is a Brownells exclusive AR-9 featuring a 5-inch barrel, blowback operation, an MLOK handguard with a solid dovetail interface, a last-round bolt hold-open, and a generously flared magwell. It is designed for reliability with a high feed angle and robust bolt carrier group.

How accurate is the Foxtrot Mike FM-9B?

Accuracy testing at 50 yards showed variable results. With Federal HST 124gr +P, groups were around 1.75 inches. However, accuracy was significantly degraded when a Surefire muzzle device was attached, suggesting barrel harmonic interference.

What are the pros and cons of the Foxtrot Mike FM-9B?

Pros include its solid build, reliable last-round bolt hold-open, flared magwell, and robust operating system. A notable con is the non-threaded 1/2x28 barrel, limiting suppressor and standard muzzle device compatibility without an adapter. The lack of castle nut staking is also a minor point for some.

What ammunition performed best in the FM-9B review?

During the accuracy testing at 50 yards, the Federal HST 124 grain +P ammunition yielded the best results, producing a group just under two inches. Other tested ammunition, like Red Army Standard and Minuteman, produced larger groups.

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