AR-15 vs Armalite AR-10

1964–Present

1956–present

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

Tens of thousands (original), widespread modern clones

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

1016 mm

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

508 mm

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

4.0–4.5 kg

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

20 rounds

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

direct impingement or piston

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

single-stage

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

Iron sights or optics