- "Semi-automatic pistol with low-caliber, high-velocity rounds. Used by FBI SWAT."
— In-game description
The 5.7 USG is a handgun that sacrifices damage for having the highest magazine capacity of all handguns. It also has a decent hip fire accuracy. While its high capacity does increase room for error, it's relatively sub-par in close-range engagements due to its somewhat underwhelming damage.
- High magazine capacity
- Subpar damage output
- Low reserve ammo
There are two Situations where a 5.7 USG is wielded. The Suburban Extraction Situation has an FBI SWAT Recruit equipped with an R4-C and a 5.7 USG as a sidearm. The Tubular Assault Situation has the Operator Ash equipped with a G36C and a 5.7 USG. In Both Situations, the 5.7 USG is equipped with the Muzzle Brake.
Suppressed (Zero Only)
- Despite its name implying that the weapon is the USG model, the 5.7 USG is actually based on the Mk 2 model, due to the cocking serrations at the front of the slide.
- The 5.7 USG and the GSh-18 are the only pistols in Siege capable of destroying a standard barricade without reloading.