Heckler & Koch HK91 vs L1A1 Self-Loading Rifle

1977–2000

1954–1989

~250,000 estimated

Approximately 1,000,000

1,020 mm (40.2 in) with stock extended

1143 mm

508 mm (20.0 in)

554 mm

4.3 kg (9.5 lb) empty

4.31 kg

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

20 rounds

Roller‑delayed blowback, closed bolt

Gas-operated, tilting breechblock

Single‑stage semi‑automatic trigger with manual safety lever

Single-action

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

Adjustable front post, aperture rear