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The Foxtrot Mike Products AR-15 FM-9 Monolithic 9mm Upper Receiver is modelled after the Colt pistol-caliber carbine and is perfect for AR enthusiasts looking to build a pistol or carbine. The Upper Receiver is available in 3 different barrel lengths: 16, 10.5 or 8.5 inches, depending on what you're building. Made from 6061-T6 aluminium, each complete upper has a proprietary charging-handle design and is non-reciprocating. While designed to be used with lower receivers that use Colt SMG magazines, it's also compatible with Glock magazine feed lower receivers.

The FM-9 Monolithic 9mm Upper Receiver comes with an M-LOK compatible handguard. All three uppers feature a PCC (Pistol-Caliber Carbine) Ultra-Light barrel, with the 16" barrel coming with an FM-9 Muzzle Brake, while the 8.5" and 10.5" barrels come with a forward blast diffuser. The 10.5" Upper Receiver features an 8.5" Ultra-Light Barrel with a 10.5" Handguard, making it an ultra-compact upper. It's made in the USA and comes in black finish. The 1/2-36" threads are also a notable feature.

It's important to note that the Foxtrot Mike Products AR-15 FM-9 Monolithic 9mm Upper Receiver is entirely made in the USA and does not support aluminum cased ammunition, Korean-manufactured magazines, and Spikes Tactical 9mm Glock lower receivers.