AR-15 vs Kel-Tec SUB-2000

1964–Present

2001–present

12,000,000+ units (combined military, law‑enforcement, and civilian production)

Unknown

840 mm (33.1 in) with stock extended (16 in barrel), 730 mm (28.7 in) with stock collapsed (14.5 in barrel)

406 mm (16 in) standard, 368 mm (14.5 in) carbine, 508 mm (20 in) designated marksman, 254 mm (10 in) pistol‑length

2001

3.2 kg (7.1 lb) empty (16 in barrel, without optics)

in production

30 rounds standard, 10/20/40/60 round options, drum magazines up to 100 rounds

Unknown

Direct‑impingement gas system (original) or short‑stroke gas piston (aftermarket/variant), rotating bolt, semi‑automatic or select‑fire

Single‑stage semi‑automatic trigger; military select‑fire models use a two‑stage fire selector with safe, semi, burst, and automatic modes

Standard: detachable flip‑up rear iron sight and fixed front post; many models equipped with Picatinny rail for optical, holographic, or night sights