Primary Arms Exclusive

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.

Features:

  • 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.