Semi-automatic carbine
Cal. 9x19mm, .40S&W, .45 ACP
Magazine: 10-15-30 round (9mm), 10-11 round (.40), 8 round (.45) semi-automatic handgun type
Barrel: 16.6 inches
Weight: 5.7 pounds unloaded

(Pictured with top, side, and bottom rail addons.)

The Cx4 is a pistol-caliber carbine designed for personal defense in a small, low-recoil package. It is suited for use in a compact environment, mostly as a cockpit gun. It comes in 9x19mm, .40 S&W, and .45 ACP variants, each using magazines compatible with the Beretta M92 (9mm), Beretta M8000 (.40), and Beretta M8045 (.45), as well as 9mm and .40 variants which use 17 round and 13 round Px4 magazines, respectively, instead. It is available with a top-mounted full-length Picatinny rail, two short front side-mounted rails, and one short under-barrel Picatinny rail, and comes stock with a retractable pistol-type rail.

The P90 is really tiny, and designed to pack the power of an assault rifle into a small personal defense weapon for operators who need to be able to keep such a weapon in a small space, such as tank operators and helicopter pilots.

The P90 is the only gun besides the FN Five-seveN to use the 5.7x28mm round, thus it's certainly not cheap. However, it is able to pierce CRISAT armor at 100 yards, making this compact gun still a formidable weapon.

Great for making gigantic sparks on alien body armor.

Submachine gun
Cal. 9x19mm
Magazine: 15-30-40 round detachable box/100 round detachable drum
Barrel: 8.85 inches
Weight: 5.59 pounds unloaded

(MP5A5 pictured, with collapsible stock and pictograph trigger group.)

The submachine gun. The standard by which all others are judged. Perhaps the greatest submachine gun ever.

Or not; but still, the MP5 is a compact, accurate, reliable submachine gun in use across the entire world of Earth, Sol, Milky Way. You cannot go wrong with the MP5.

The MP5 comes with SEF trigger group and solid fixed stock (MP5A2), SEF trigger group and collapsible stock (MP5A3), pictograph trigger group and solid fixed stock (MP5A4), and pictograph trigger group and collapsible stock (MP5A5.) Trigger groups are safe, semi-automatic, and fully-automatic; safe, semi-automatic, three-round burst, and fully-automatic (pictograph trigger group only); safe, semi-automatic, two-round burst, and fully automatic (pictograph trigger group only); and safe and semi-automatic.

Submachine gun
Cal. 10mm
Magazine: 30 round detachable box
Barrel: 8.85 inches
Weight: 5.88 pounds unloaded

(MP5/10A2 pictured, with fixed stock.)

The 10mm version of the universally popular MP5 submachine gun. This, however, is equipped with last-round bolt hold-open, at the behest of the Federal Bureau of Investigation of The United States of America, North America, Earth, Sol, Milky Way.

Trigger groups are safe, semi-automatic, three-round burst, and fully-automatic; safe, semi-automatic, two-round-burst, and fully-automatic; and safe, semi-automatic, and fully-automatic.

The MP5/10 is only available with the polymer HK pictograph lower receiver, and is available with a solid fixed stock (MP5/10A2) or collapsible stock (MP5/10A3.)

Submachine gun
Cal. .40 S&W
Magazine: 30 round detachable box
Barrel: 8.85 inches
Weight: 5.88 pounds unloaded

(MP5/40A3 pictured, with collapsible stock.)

The .40 caliber version of the universally popular MP5 submachine gun. The MP5/40 is basically the MP5/10 slightly altered for the .40 S&W cartridge.

Trigger groups are safe, semi-automatic, three-round burst, and fully-automatic; safe, semi-automatic, two-round-burst, and fully-automatic; and safe, semi-automatic, and fully-automatic.

The MP5/40 is only available with the polymer HK pictograph lower receiver, and is available with a solid fixed stock (MP5/40A2) or collapsible stock (MP5/40A3.)

The compact version of the universally popular MP5 submachine gun. The barrel length was cut down by almost half, and a built-in vertical foregrip was added.

All variants of the MP5K are available with SEF and pictograph trigger groups. It is available stockless and with no protruding barrel (MP5KA4) and with a skeleton side-folding stock with a protruding three-lug and threaded barrel (MP5K PDW.) Trigger groups are safe, semi-automatic, three-round burst, and fully-automatic; safe, semi-automatic, three-round-burst, and fully-automatic; and safe, semi-automatic, and fully-automatic.

Submachine gun
Cal. 9x19mm
Magazine: 15-30-40 round detachable box/100 round detachable drum
Barrel: 5.73 inches
Weight: 6.83 pounds unloaded

(MP5SD5 pictured, with fixed stock and pictograph trigger group.)

The integrally sound suppressed version of the universally popular MP5 submachine gun. One of the quietest sound suppressed rifles in the known universe.

The MP5SD comes with SEF trigger group and solid fixed stock (MP5SD2), SEF trigger group and collapsible stock (MP5SD3), pictograph trigger group and solid fixed stock (MP5SD5), and pictograph trigger group and collapsible stock (MP5SD6.) Trigger groups are safe, semi-automatic, and fully-automatic; safe, semi-automatic, three-round burst, and fully-automatic (pictograph trigger group only); safe, semi-automatic, two-round burst, and fully automatic (pictograph trigger group only); and safe and semi-automatic.

Submachine gun
Cal. 9x19mm
Magazine: 20, 25, 32 round detachable box (Uzi type)
Barrel: 10.25 inches
Weight: 8.16 pounds unloaded

The Uzi is a classic submachine gun. Though overly heavy for its size, and not exactly what one could call ergonomic, it's reliable and pretty cool looking.

Available with under-folding metal stock or fixed wood stock. Trigger group is safe, semi-automatic, and fully-automatic only.
 

Submachine gun
Cal. 9x19mm
Magazine: 20, 25, 32 round detachable box (Uzi type)
Barrel: 7.75 inches
Weight: 6 pounds unloaded

A shortened variant of the original Uzi. Available with under-folding or side-folding metal stock, and safe, semi-automatic, and fully-automatic trigger group.
 

A machine pistol variant of the Uzi, with no foregrip. Available only with side-folding metal stock and safe, semi-automatic, and fully-automatic trigger group.