|Type||General purpose machine gun|
|Place of origin||Astronea|
|Used by||Astronean Armed Forces|
|Manufacturer||Talamnrath Precision Systems|
|Variants||KN-3T, KN-3 AO machine gun|
|Length||1,119 mm (44.1 in)|
|Barrel length||605 mm (23.8 in)|
|Action||Gas-operated, open bolt|
|Rate of fire||650 rounds/min|
|Muzzle velocity||825 m/s (2,710 ft/s)|
|Effective range||1,000 m (1,100 yd)|
|Maximum range||3,000 m (3,300 yd)|
|Feed system||non-disintegrating metal belts in 100 and 200/250 round ammunition boxes|
|Sights||Tangent iron sights|
The KN-3 is a general-purpose machine gun designed in 1960 with the purpose of augmenting the squad fire-support role from heavier tripod mounted machine guns to a man-portable system that could be operated by one soldier.
It features a quick change barrel for swapping out barrels when they overheat, as well as a carry handle for ease of maneuvering. Informally, this also allows the weapon to be effectively fired from the hip, albeit in short bursts, in situations where a soldier must lay down fire while on the move.
The KN-3 is sold in both 7.62x51mm and 7.62x54mm for export purposes.
The KN-3 machine gun series is an open bolt design, which improves heat management during automatic fire compared to closed bolt designs and helps avoiding the dangerous phenomenon known as "cook-off", wherein the firing chamber becomes so hot that the propellant contained in a chambered round unintentionally ignites, making to weapon fire until the ammunition is exhausted. Open bolt designs typically operate much cooler than closed bolt designs due to the airflow allowed into the chamber, action and barrel during pauses between bursts, making them more suitable for constant full-automatic weapons such as machine guns. The KN-3 is normally issued with several quick change barrels that during prolonged intensive use are swapped out allowing one barrel to cool while the machine gun fires with the other.
The breech is locked by a rotating bolt, with two locking lugs engaging locking recesses in the receiver. The gas piston is hinged lo the bolt carrier assembly, and its vertical travel makes it possible to bend the group making machine gun assembly and disassembly for maintenance easier. The protruding rear part of the bolt carrier assembly features spiral shaped cuts, which provide a controlled rotation of the bolt. The mainspring is accommodated in the bolt carrier assembly slide channel. A cartridge extractor with a latch is mounted in the rear part of the bolt carrier assembly. The cocking lever, mounted on the right, is not integral with the bolt carrier and does not reciprocate as the gun fires. The machine gun fires from the rear sear.
The gas cylinder is mounted under the barrel and fitted with a gas regulator with three fixed positions. The gas regulator opens corresponding holes to change the amount of expanding propellant gases bled off out of the gas cylinder into the atmosphere, thus varying the amount of energy transferred on to the long-stroke piston. Receiver
The trigger assembly, mounted inside the receiver, is operated by the mainspring and suitable for automatic fire. It has no single shot mode. The manual rotating type safety locks the sear, which engages the sear notch of the bolt carrier assembly, and the trigger lug does not allow the bolt earner assembly to go all the way back
KN-3T coaxial variant
The KN-3T has been mounted on main battle tanks, infantry fighting vehicles and armoured personnel carriers in various formats, both alongside the barrel and on top-mounted machine-gun positions above commander hatches. More modern systems integrate the KN-3T into remote-weapon systems with a remote-controlled 360° turret and a digital camera.
Modernized KN-3AO MMG
The AO version also integrates a picatiny system for the mounting of optics and illumination devices.
The KN-3AO is expected to serve with the AAF for the foreseeable future.