Foxtrot Mike Products PA Exclusive FM9 3 Gun 9mm AR-15 Complete Upper - 16"

Manufactured by Foxtrot Mike Products
Manufactured by Foxtrot Mike Products
2 Reviews
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Why build a 9mm AR-15 from the ground up when you can get a head start with this complete upper from Foxtrot Mike Products? The FM-9 3-gun complete AR-15 upper receiver assembly comes with a large assortment of features and improvements over standard pistol caliber carbines. This AR9 features an ambidextrous charging handle with large latches. The monolithic upper and handguard are attached via a proprietary locking system to ensure that it doesn’t loosen over time. This free float rail also uses the M-LOK system, so you can attach your favorite lights, grips, or other accessories. Underneath the M-LOK handguard is a 16” 4150 chrome moly barrel that has a 1:10 twist to stabilize all 9mm bullets. This complete AR-9 3-gun upper receiver group is a great option for getting into competition shooting such as 3-gun, steel challenge, or any other competition where pistol caliber carbines are legal.

  • 16” 9mm barrel with PWS Muzzle Brake
  • Primary Arms Exclusive!
  • Ambidextrous charging handle
  • 15” M-LOK free float handguard
  • Proprietary handguard / upper interlock keeps handguard true to the upper
  • Handguard and upper made from 6061-T6 aluminum
  • Includes 9mm bolt
  • Type 3 hardcoat anodized finish
  • Limited lifetime warranty through Foxtrot Mike Products

The receiver and handguard are machined from 6061-T6 aluminum and have a Mil-Spec Type 3 hardcoat anodized finish. Feature rich, high-quality, and affordable, Foxtrot Mike Products offer cutting edge solutions utilizing the highest quality materials and manufacturing processes available.

Manufacturers Note: FM Products does not support the following items, using these may void the lifetime warranty associated with our uppers;
1) FM Products does not support Aluminum Cased ammo.  Blow backs have a much higher pressure spike in the chamber than a handgun.  Using Aluminum cased ammo in a blow back PCC is dangerous and will void the lifetime warranty of an FM Products Upper Receiver.
2) FM Products does not support import magazines besides OEM Glock magazines.  We recommend Magpul, OEM Glock and ETS magazines only.
3) FM Products does not support Spikes Glock style lower receivers.  The LRBHO requires consumers to modify the FM Products upper, to make egress for the Spikes LRBHO.  The FM Products upper is cut to the Colt spec, therefore we have no plans to deviate from that.  Modifying your FM Products Upper to accommodate a Spikes Tactical Glock style lower will void the lifetime warranty on our PCC Uppers.   
4) We only recommend Sylvan magwell adapters, as they require no modifications or adjustments to work properly.   FM Products does not support Stern Magwell Adapters as they require regular adjustments to work properly.
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Barrel Length16
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandFoxtrot Mike Products
Caliber Gauge9mm Luger
Gas System LengthBlowback
Gas System TypeBlowback
Handguard15 in M-LOK Rail
Muzzle DeviceMuzzle Brake
Twist Rate1:10
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

2 reviews

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Impressed with this upper


Received this upper and immediately put it on my Rock River lower with Hahn adapter running Colt SMG mags. Mounted a Sig Romeo5. Sighted it in using 3 shot groups at 50 yards. 4 groups in had it dead on, all 3 holes touching. Was impressed with the quality of the components for the price. Last round bolt hold open worked great. We'll be using it for PCC competitions.

A Very Fine Upper


Put one on a friend's lower and it functions perfectly with several factory hardball loads. No hiccups whatsoever. Bench tested 5-shot groups ran 2 to 2-1/2" at 50 yards using the ball ammo. Plenty good for any scenario in an urban environment. Fire standing position w/o sling on a 1/2 size steel echo target at 100yds and dinged it every single time. The only drawback was recharging the weapon while slung up with a 2 point sling. You must break position to pull the charge lever back. Had it been on the right side, no problem.