Heckler & Koch
The MP5 is a burst-fire submachine gun from the main campaign, and its compact MP5k form carries the variants. Its Blue Fractured version from Lost Between Worlds has far better accuracy.
It is a light, quick-handling SMG for close work. Low damage per round means you rely on volume of fire. Burst mode helps you stay on target at medium range.
DIY Death trades damage for better handling and stealth. Blue Fractured hits harder and is much more accurate than the base gun. The Libertad Custom keeps base stats but takes high-end mods.
It takes standard, armor-piercing, soft-target, poison, blast and incendiary rounds. You carry 180 rounds, or 360 with the Tactical Pocket.
BP-SMG
The BP-SMG is a compact submachine gun that sprays quickly from a 30-round magazine. It is a good close-range stealth gun with a suppressor, and its unique Iron Curtain fires soft-target rounds.
BZ19
The BZ19 is a submachine gun with a huge helical magazine of 64 rounds. You can hold the trigger far longer than with any other SMG, and its unique Turn Of The Century sits at Resplandor Agriculture in Lozanía.
M12
The M12 is a Beretta submachine gun with a 32-round magazine and three fire modes. Its unique Five-Alarm version comes from an insurgency, and São Paulo Stinger is a customizable variant.
M249 SAW
The M249 is a light machine gun, labeled Tacticool in game, with one of the highest fire rates you can get. It is sold only through Lola's Black Market or the online store.