990 SPX Magpul - Class 3 vs Mossberg 500

2015–Present

1964–Present

~150,000 estimated

10,000,000+ units (cumulative worldwide)

965 mm (38 in) with stock extended, 889 mm (35 in) with stock collapsed

965 mm (38 in) with stock extended; 864 mm (34 in) with stock collapsed (tactical models)

508 mm (20 in) standard, 457 mm (18 in) Compact variant

406 mm (16 in) standard; 457 mm (18 in) and 508 mm (20 in) options

3.40 kg (7.5 lb) empty (standard), 3.10 kg (6.8 lb) Compact

2.95 kg (6.5 lb) empty (12‑gauge, 18‑in barrel)

5+1 rounds standard internal tube, 7+1 with extended tube, 8+1 with aftermarket magazine tube

5+1 rounds standard; 6+1, 7+1, 8+1 tube extensions available; detachable box magazines up to 5 rounds

Pump‑action, long‑stroke recoil operation with chrome‑lined barrel and stainless‑steel bolt

Pump‑action, slide‑action bolt with dual‑action locking lug; steel receiver with anti‑jam bolt design

Dual‑stage, single‑action trigger with adjustable pull weight

Single‑stage trigger with manual safety lever; optional ghost‑ring safety on tactical models

Fiber‑optic front bead, rear ghost‑ring sight; optional Picatinny‑mounted night sights

Bead front sight; optional ghost‑ring rear sight or fiber‑optic front sight on tactical variants