The MP40 is a WW2 German submachine gun that is accurate with little recoil but fires slowly. It is easy to get, and its gold Tsarevich version ranks among the best SMGs in the game.
The base gun is a steady early SMG, but its low fire rate leaves it behind modern SMGs. Tsarevich is the version worth chasing; its armor-piercing rounds allow headshots on elite soldiers.
Buy it from Juan's arms dealers or the Guerrilla Garrison, or loot it from FND chests. Raid the FND 2nd Armored Division in Madrugada for Streamline Moderne. Crush Nicolás Najarro's insurgency for Tsarevich.
Streamline Moderne has a bigger magazine and lets Dani move faster while aiming, but its soft-target ammo struggles late in the game. Tsarevich is the stronger all-rounder. Neither unique can be changed at a workbench.
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.