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- "Semi-automatic pistol with low-caliber, high-velocity rounds. Used by FBI SWAT."
— In-game description
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.
The 5.7 USG is a handgun that sacrifices power for having the highest magazine capacity of all handguns. It also has a decent hipfire accuracy. Despite this, it's relatively sub-par in close-range engagements due to how small the damage is for it to be truly effective. It also has only three reserve magazines in PVP, making it ironically necessary for precision to be a top priority.
- 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.