An older design of the Pulse Rifle commonly used by Colonial Marines. Uses 10x24mm caseless ammunition. Holds 95 armour piercing rifle rounds per magazine. Slightly less accurate than the standard MK2 but fires in 4 round bursts instead of 3. It's also less modular than the MK2 but makes up for it in its high capacity armour piercing magazines. It is also notable for being able to use a wide variety of ammunition, taking both MK1 and MK2 magazines.
Four rifles can be found in the command armory on the Almayer and it is issued to Squad Leaders and where they're available at their Colonial Marines Automated Vendors. It is also one of the possible rifles for the Freelancer Mercenaries.