KAC Stoner LMG

KAC Stoner LMG

Knight's Armament


Government agencies please contact us for pricing


The Knight’s Armament Company Light Machine Gun ranks as the world’s most lightweight, simple, versatile, and controllable light machine gun. Eliminating the need for a bolt buffer mitigates recoil effect common to machine guns, as there is no impact of the bolt on the end of its stroke, making the gun very easy to control – even in long bursts. The LMG features a hybrid modular MIL-STD-1913/KeyMod forend and an underslung mounting slot for accepting standard and improved 5.56 mm belted ammunition containers. The LMG is extremely accurate due to the secure mounting of the “quick change” barrel, and the reduced length feed cover design, which accommodates loading and unloading without disturbing the zero of rearward mounted optics or sights.

Knight’s Armament has designed and built the most controllable and lightweight machine guns in its class with the Stoner LMG. This is a belt-fed support weapon capable of suppressive or grazing fire while still being easily transportable and controllable. It is fed either from a 100-round sack or a 200-round box filled with linked 5.56 ammunition. The amount of rounds being put downrange by this type of weapon makes a magazine fed system impractical.

In a belt fed weapon, certain mechanical parts are synced together and operated by the motion of the weapon’s bolt. These parts are responsible for gripping the linked ammo belt and drawing them into the weapon’s chamber. They then reset and are ready to drag the next cartridge into place. As the bolt moves forward, the cartridge is pushed forward, out of the links, and is driven in front of the bolt face. The weapon cycles as a regular gas-impingement system will, firing the round and extracting the empty cartridge and used links. The pawl then drags the next round into place and the cycle repeats.

Knight’s Armament has pioneered a unique and highly effective method for reducing weight and stress, while effectively dissipating heat in our barrels. Several of our weapon systems feature a Ball Mill Lightened, or Dimpled Barrel.

This process reduces the overall weight of the barrel and effectively increases the surface area, allowing it to cool faster than a standard or fluted barrel. The pattern of dimpling (rows of offset spheres) allows the stress inherently created by the process to be relieved by adjacent rows of dimpling. Any barrel with this sort of alteration has a natural yaw that will occur while firing; however, this dimpling pattern greatly reduces that undesired side effect. These barrels are extremely reliable, lightweight, quickly cooled, and accurate components.

Knight’s Armament employs a hammer-forging process on a number of our barrels and chambers, which serves to increase the quality of their interior finish, as well as increasing the durability and life of the barrel. These barrels are then Chrome-lined to further the lifespan of the barrel and increase its resistance to fouling and corrosion.


The first step is to take a drilled barrel and hone the interior to a fine, clean finish. The barrel is then placed onto a mandrel with the rifling pattern ground in relief across it. This setup is then placed between opposing power hammers which literally hammer the barrel onto the pattern found on the mandrel. The barrel setup is rotated and the hammers continue to forge the barrel into its final shape. Once they complete this process, the barrels are heat treated in order to relieve the inherent stress created during this process.

The Chroming process is applied after the Hammer Forging. At this point the interior of the barrel is basically lined with a layer of chrome and bonded to the forged steel. Chrome is approximately twice as hard as standard 4150 steel and also resists the lead and powder that bare steel will normally absorb into its pores. This allows the barrel to be exposed to the higher temperatures and pressures of high firing schedules while still maintaining accuracy, durability and reliability. The end result is a denser, stronger barrel that will endure a higher round life than a Standard Stainless Steel or Chrome Moly barrel.


*Please note: Due to ITAR, KAC products can not be shipped out of Canada.

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