M3 Grease Gun vs SIG MPX

1942–1945

2015–present

Over 680,000

Unknown

757mm (29.8 in) stock extended / 579mm (22.8 in) stock folded

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

203mm (8.0 in)

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

3,700g (8.15 lb) empty

2.67 kg (5.9 lb) 4.5-inch barrel

30 rounds

10, 20, or 30 rounds — translucent polymer

Blowback, open bolt

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

Selective fire (semi/full auto)

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

Fixed blade front, flip-up L-type rear (100 and 200 yards)

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