Complete Flattop Upper for Pistol Caliber AR-15 Carbines

The Foxtrot Mike Products 9mm Upper Receiver comes fully assembled and ready to drop on any pistol caliber lower receiver that uses Glock magazines. With its full-length Picatinny top rail and M-LOK compatible handguard, the Foxtrot Mike 9mm Upper offers plenty of mounting space for optics and other accessories.

While the 5” upper receiver utilizes a standard AR style rear mount charging handle the 8.5”, 10.5”, and 16” upper receivers use an ambidextrous, non-reciprocating forward charging handle.



A unique interlocking connector between the upper receiver and handguard ensures the barrel nut will not work loose over time.

Premium Melonite-finished 4150 carbone steel

Button-rifled bore, 1-10" twist

½"-36 threaded muzzle

Bolt/carrier unit with hard Melonite finish, too

Engineered to function reliably, no matter which manufacturers’ lower it’s mated with, the Foxtrot Mike 9mm Upper Receiver is forgiving enough to cycle even the most economical (we’re not saying "cheap"!) steel or brass cased ammo.

Foxtrot Mike Products FM-9 Upper Receivers are not compatible with aluminum cased ammunition, Korean magazines or Spikes Tactical 9mm Glock® lower receivers. Stern Defense 9mm Conversion Adapter is also not recommended for use with FM Products uppers as it requires adjustment to work properly.



Big Book Catalog, Issue:72, Page:005