Type-X Modifiable Weapon System

The is a Plainsfierian rifle capable of using a variety of attachments. Developed originally during the Plainsfierians days underground within the Covenant, it was designed to be a highly versatile rifle for use in planned insurrections. Due to the flexibility of the design, it survived mostly unchanged to the modern day.
==Description==
The Type-X MWS is built around a central rifle stock, with a firing chamber, grip, safty selector with fully automatic, burst, single shot and safe, a bullpup style magazine placement, shock absorbing, recoil compensating stock and computerised heat sink/exchange. Mounted above the barrel assembly is a computerised scope, capable of project bullet trajectories, adjusting to meteorological conditions and adjusting for night and infra-red vision, with a variable zoom up to 10x and emergency iron sights.
The bolt assembly can take different barrel modifications to augment the gun, such as a longer barrel, heavier barrel with a bipod, a shorter or a shorter, snub barrel, and a shorter, lighter stock. The normal 40 round magazine can be changed for lighter 24 round magazines or heavier 80 and 130 round magazine. The barrel and stock assemblies can be changed very quickly and efficiently, allowing the weapon to be quickly adjusted for a variety of roles. In addition, it can be fitted with a 43mm grenade launcher, launching primarily adhesive plasma grenades. 
The MWS shares its ammunition type with the Type-51 Carbine, using the same high power caseless radioactive ordnance. The Ordnance is snub nosed and incredibly hard, causing heavy damage to flesh and armour. It travels at 700 metres per second and is propelled by 'cold plasma' explosions, acting like gunpowder.
==UNSC Remarks==
"Those things are pretty cool: you've got a sub-machine gun, a carbine, a shotgun, a heavy weapon, and a sniper rifle all at once. Well, not exactly all at once, but pretty close."