Ares FMG vs SIG MPX

1985–1987

2015–present

Fewer than 20 prototypes

Unknown

262 mm (10.3 in) folded; 503 mm (19.8 in) unfolded

425mm (16.7 in) stock folded, 610mm (24 in) extended

203 mm (8.0 in)

114-203mm (4.5-8 in) — multiple configurations

2.38 kg (5.25 lb) empty

2.67 kg (5.9 lb) 4.5-inch barrel

20 or 32 rounds (Uzi magazines)

10, 20, or 30 rounds — translucent polymer

Straight blowback, open bolt

Gas-operated, short-stroke piston, closed bolt — rifle-derived

Single-stage, selective fire (semi-auto/full-auto)

Selective fire (safe, semi, full auto on military models)

Fixed front post, fixed rear notch

Flip-up iron sights, full-length MIL-STD-1913 rail