The upper receiver is machined from billet aluminum allowing for a greater degree of customizability for look and function. Foxtrot Mike is building some of the most popular AR-9s on the market and Primary Arms is proud to offer them directly to you.
- 7” barrel chambered in 9mm
- Billet upper receiver
- Blow back recoil mechanism
- Tri-Lug Adapter
- 1.3″ internal diameter handguard
- 5.5″ M-LOK handguard
Manufacturers Note: For optimal reliability, FM Products does not recommend using aluminum case ammo in their uppers or complete firearms.