Heckler & Koch HK91 vs PTR 91 (G3 Clone)

1977–2000

2002–present

~250,000 estimated

Unknown

1,020 mm (40.2 in) with stock extended

1020 mm

508 mm (20.0 in)

450 mm

4.3 kg (9.5 lb) empty

4.3 kg

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

20 rounds

Roller‑delayed blowback, closed bolt

roller-delayed blowback

Single‑stage semi‑automatic trigger with manual safety lever

two-stage

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

Diopter sights