The M.P.A.W.450 is the Multiple Purpose Assault Weapon and is standard issue assault rifle to all the BioSystems soldiers, with either a reflex sight or a 1.5 to 3.5 zoom tactical scope and a laser sight or flashlight on the end. It can be optimized with several types of ammunition including; knockout darts, armor piercing rounds, incendiary rounds and a grenade launcher which can fire explosive, teargas, smoke, flashbang, EMP or sonic grenades, its sort of like a cross between the real life FAMAS, the SC20K from Splinter Cell (bullpup configuration=sweet) and the S.C.A.R. from CRYSIS (AWESOMEST GAME LIKE, EVER1!!1!1) only futurey-er. Kroze carries a modified one around with a bunch of tactical attachments.

Then there's the LSA68 and MLSA19 or Light Semi Auto 2668 and Modified Light Semi Auto 2719, a standard 9mm pistol used by basically everyone and its modified 7mm counterpart, both have silencer and laser sight attachments. The latter was invented by the empowered.

The Hemsly 1401 .65 cal machine gun has been around since the 2500's and is still used. It is called the "Blanka" because of the noise it makes when fired (it sounds like the BAR from CoD:FH).

The Klinton20 assault rifle is left over from the last war and is overused despite its age.

Edit: the APAW or all-purpose-assault-weapon is basically a handle that can be customised with dozens of different stocks, clips of different ammo types/sizes and capacities from .50 sniper APR to 8 guage shotgun. basically its every weapon in one.