Glock 18 vs Glock 45

1986–Present

2018–Present

~250,000 estimated (including all variants)

500,000+ units (estimated)

204 mm (8.03 in) standard, 236 mm (9.29 in) on 18C model

189 mm (7.44 in)

102 mm (4.02 in) standard, 135 mm (5.31 in) on 18C model

102 mm (4.02 in)

625 g (1.38 lb) empty (standard), 730 g (1.61 lb) with 33‑round magazine

587 g (20.7 oz) empty

33 rounds standard, 50‑round drum, 10‑round compact magazines available

17 rounds standard, 10/15/33 round options

Short recoil, locked breech, striker‑fired Safe Action system

Short recoil, locked breech, striker‑fire

Safe Action striker‑fire with slide‑mounted fire selector (semi‑auto / fully‑auto)

Glock Safe Action (pre‑cocked striker, trigger safety, firing pin safety)

Fixed polymer rear notch and front post; optional tritium night sights and aftermarket rail‑mounted optics

Fixed polymer front post, fixed rear notch (optional tritium night sights)