Heckler & Koch UMP vs Thompson Submachine Gun

1999–present

1921–Present

~1,500,000 units (World War II peak production) and limited post‑war runs

17.5 in (445 mm) stock folded / 27.6 in (700 mm) stock extended

762 mm (30.0 in) with stock extended; 660 mm (26.0 in) with stock folded (M1A1)

8.0 in (203 mm)

254 mm (10.0 in) standard; 305 mm (12.0 in) for some export models

5.1 lb (2.3 kg)

4.4 kg (9.7 lb) empty (M1); 3.9 kg (8.6 lb) empty (M1A1)

25 rounds (.45 ACP)

20‑round box, 30‑round box, 50‑round drum, 100‑round drum (rare)

Straight blowback

Simple blow‑back, open‑bolt, selective‑fire; rate of fire 600–1,250 rpm depending on model

Single-stage

Two‑stage trigger: semi‑automatic (first pull) and fully‑automatic (second pull) on early models; later models use a single‑stage full‑auto trigger with a selector switch

Fixed front post, flip-up rear diopter

Rotary drum rear sight with 50, 100, 200, 300 yard settings; hooded front post; optional adjustable rear sight on later police variants