Foxtrot Mike Products 11.25" Barreled Upper Receiver - 10.5" M-LOK Rail with Muzzle Brake

Manufactured by Foxtrot Mike Products
SKU: PA-FM556-11
MPN: PA-FM556-12
Manufactured by Foxtrot Mike Products
1 Review

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Why build an AR-15 from the ground up when you can get a head start with this upper from Fox Trot Mike Products? The FM AR-15 upper receiver assembly comes with an assortment of features and improvements over standard AR platform uppers. The monolithic upper and handguard are attached via a proprietary locking system to ensure that it won't loosen over time. The 10.5" free float rail utilizes the M-LOK system for attaching lights, grips, and other accessories. Underneath the M-LOK handguard is a 11.25" 4150 chrome moly barrel. This barrelled AR-15 upper receiver group from Foxtrot Mike Products is a great option for your next build.

  • 5.56 NATO barreled upper receiver
  • 11.25" 4150 chrome moly barrel
  • 1:8 twist rate
  • Lightweight barrel profile
  • 10.5" free float M-LOK handguard
  • Carbine length gas system
  • Proprietary handguard / upper interlock
  • Handguard and upper made from a billet of 6061-T6 aluminum
  • Type 3 hardcoat anodized finish
  • Limited lifetime warranty through Foxtrot Mike Products

Foxtrot Mike Products produces high-quality, affordable, feature-rich firearms for the everyday consumer. Their cutting-edge firearms offer long lasting quality and dependability at an affordable price.
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Barrel Coating
Barrel Length11.3
Barrel Material4150 Chrome Moly Steel
BrandFoxtrot Mike Products
Caliber Gauge5.56 NATO
FinishHardcoat Anodized
Gas System LengthCarbine
Muzzle DeviceMuzzle Brake
Twist Rate1:8
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

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Poor design

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While the entire upper is a quality product ...the plastic shell deflector is a poor design. If you are using an aftermarket dust cover like the Strike industries Ultimate Dust Cover (billet or polymer) the plastic deflector has to be shaved and is still too non compatible to work or swing freely.