Freedom Ordnance is an American firearms manufacturer based in Chandler, Indiana, specializing in the design and production of AR-platform rifles, pistols and accessories engineered and built entirely in the United States. The company has earned a reputation for innovative designs, including the FX-9 series of 9 mm pistol-caliber carbines and the unique FM-9 belt-fed system.
Freedom Ordnance FM-9: How the Belt-Fed System Works
The Freedom Ordnance FM-9 is one of the very few firearms chambered in 9x19 mm to employ a belt-fed system using disintegrating metallic links. Originally developed as an upper receiver compatible with standard AR-15/M16 lower receivers, the design incorporates both the operating mechanism and the complete feed system within the upper assembly.
It is worth noting that while the standard FM-9 is belt-fed only, the FM-9D version can also feed from conventional detachable box magazines compatible with Glock-pattern magazines.
One of the most innovative aspects of the design is its proprietary disintegrating link. Unlike military rifle cartridges, the 9x19 mm features a short, nearly cylindrical case, making reliable belt feeding considerably more challenging. To overcome this, Freedom Ordnance developed a dedicated spring-steel link that retains the cartridge by engaging the extractor groove. During the operating cycle, the bolt strips the cartridge from the link and chambers it directly. The now-empty link separates from the belt and is ejected from the firearm.
The entire feed system is synchronized with the movement of the bolt carrier. A small roller machined into the top of the carrier actuates the feed mechanism housed in the top cover during the rearward stroke. Each firing cycle advances the belt by one position, perfectly aligning the next cartridge with the chamber. As the bolt travels forward, it strips the round from the link and chambers it, completing the feeding cycle.
Loading procedures also differ from those of conventional machine guns. The Freedom Ordnance FM-9 is loaded with the bolt locked to the rear and the top cover closed. The ammunition belt is inserted from the left side until the first cartridge is retained by the feed mechanism. Releasing the bolt automatically chambers the first round.
Mechanically, the FM-9 operates on a simple straight-blowback system and does not employ a gas-operated action. The energy generated when the cartridge is fired drives the bolt assembly rearward, simultaneously extracting and ejecting the spent case, recocking the fire-control group and actuating the belt-feed mechanism. While the simplicity of the blowback system helps reduce the number of components, it also demands precise synchronization between bolt mass, recoil spring force and the feed mechanism.
Developing a reliable belt-feed system for the 9×19 mm Parabellum cartridge represented the project's greatest engineering challenge. The cartridge's short, minimally tapered case, combined with the relatively low rigidity of a belt of linked pistol cartridges, makes extracting each round from the disintegrating link considerably more difficult than with traditional rifle ammunition. To overcome these issues, Freedom Ordnance designed both the feed system and the disintegrating links from the ground up, as existing machine-gun components could not simply be adapted to the smaller pistol cartridge.
The result is a remarkably successful scaled-down interpretation of the belt-feed principle employed by light machine guns such as the M249 SAW and M240, adapted to the characteristics of the 9×19 mm cartridge and integrated into an AR-15-compatible platform. Even today, the FM-9 remains one of the very few commercially available pistol-caliber firearms fed by a disintegrating metallic belt, a design that continues to attract collectors as well as enthusiasts of military and sporting firearms alike.
At the time of writing, the Freedom Ordnance FM-9 is available for preorder in the United States with either an 8-inch or 16-inch barrel. Depending on the configuration, retail pricing ranges from approximately $3,600 to $4,500.
For more information, visit the Freedom Ordnance website.
