The MA5K (Kurz) Individual Combat Weapon System, designated the MA43 by the UNSC Army informally known by UNSC servicemen as the Carbine, is a stripped-down model of the standard MA5 assault rifle that has been manufactured by Misriah Armoury since before the Insurrection. Marketed as a compact defence weapon that can still fire the full-powered M118 round, the MA5K sees extensive use in the various special forces of the UNSC, as well as units operating within urban terrain. Modular and more reliable then the weapon that spawned it, the MA5K ultimately suffers from accuracy and control issues that prevents it from being widely adopted by the UNSC's mainline forces.
The MA5K was first introduced in 2443.
The MA5K is a cut-down variant of the standard MA5B assault rifle. The weapon is lighter and easier to carry than larger assault weapons, making it easier to carry.
The MA5K is used almost exclusively for commando operations. It is highly favored because of its light frame, which allows for quick manoeuvring and a less visible profile.
MA5Ks were not often used for front line duties, but they were used by the Spartan IIIs from 2531 to 2552. In addition, many comandos and high level pilots enjoyed the weapon, commandos for the reasons noted above, and pilots because its small size was more practical in the enclosed cockpit of the fighters they used.