The FM products 45 caliber upper receiver is designed to be used with the FM pistol caliber lower receivers as well as other .45 Glock lower receivers that use Glock magazines. Build the ultimate pistol caliber carbine for the range or home defense with the Foxtrot Mike complete upper receiver assembly.


  • Forward mounted charging handle (charging handle does not fold)
  • 8.5” 4150 chrome moly barrel or 16” 4150 chrome moly barrel
  • 8” monolithic free float handguard or 15” monolithic free float handguard
  • M-Lok attachment points
  • Continuous picatinny top rail
  • .45 ACP bolt carrier group included
  • FM products blast diffuser with ½x36” threads or FM products muzzle brake with ½x36” threads
  • Compatible with Glock magazines