Heckler & Koch HK91 vs HK G3

1977–2000

1958–Present

~250,000 estimated

Approximately 10,000,000 units (including licensed production)

1,020 mm (40.2 in) with stock extended

985 mm (38.8 in) with stock extended; 820 mm (32.3 in) with stock folded (G3A4)

508 mm (20.0 in)

450 mm (17.7 in) standard; 508 mm (20.0 in) G3A4; 406 mm (16.0 in) G3A3 carbine

4.3 kg (9.5 lb) empty

3.05 kg (6.73 lb) empty, 3.75 kg (8.27 lb) loaded with 20‑round magazine

20 rounds standard, 10‑round low‑profile magazines available for restricted markets

20 rounds standard steel box; 30‑round steel box; 10‑round magazine for restricted markets; 50‑round drum (rare)

Roller‑delayed blowback, closed bolt

Roller‑delayed blowback, closed bolt; bolt carrier with dual rollers and a locking piece; gas‑free operation

Single‑stage semi‑automatic trigger with manual safety lever

Single‑stage, two‑position safety (fire selector) with semi‑automatic, three‑round burst, and full‑auto modes

Adjustable rotary drum rear sight (100‑800 m) and hooded front post; optional telescopic sight mounting rail on receiver cover

Standard: rotary drum rear aperture (adjustable 100–500 m) and hooded front post; optional: telescopic (e.g., 4×24) and night sights