The .357 SMG by Zen Armaments is a submachine-gun/pistol cartridge created for the company's .357 Submachine Gun.

The .357 SMG was first used in its namesake, the .357 Submachine Gun. It soon after was adopted for use in the Zen Arms .357 Pistol. It is designed to be a high-velocity, deep-penetration caliber with satisfactory body armor penetration.

• Caliber: .357 (9 x 22 mm)
• Effective Range: 75 meters
• Maximum Range: 120 meters
• Muzzle Velocity: Pistol: 422 m/s (1,450 fps), SMG: 500 m/s (1,640 fps)
• Muzzle Blast: Small muzzle flash.

• Visual Description: Bottlednecked brass casing with a bonded metal hollow-point shell.
• Damage Rating: Tier 1, Light Anti-Personnel
• Damage Description: Hollow-points enter the body and expand, causing further damage to internal organs.

• Visual Description: Bottlenecked brass casing with a copper-coated rounded head.
• Damage Rating: Tier 1, Light Anti-Personnel-3
• Damage Description: The heavier round does more damage then standard pistol rounds but remains lower then rifle rounds in penetrative power.

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