M16A4 for Sale

Browse M16A4 listings from verified sellers across the U.S. on GunsAmerica.

Quick Look

The M16A4 is a fourth-generation M16 rifle introduced by Colt in the late 1990s as the standard-issue service rifle for the US military. It features a modular design with a flat-top upper receiver for optics mounting. Today, it remains popular with military, law enforcement, and civilian marksmen valuing its accuracy and adaptability.

Why It's a Top Choice

Proven reliability in combat conditions
Flat-top receiver supports various optics
Interchangeable STANAG magazines standard
Lightweight and balanced 5.56mm rifle
Extensive aftermarket accessory support

Key Variants

M16A4 — Standard military variant favored for marksmanship and adaptability.

M16A2 — Earlier generation with fixed carry handle, still in use for training.

M16A3 — Fully automatic fire variant used mostly by Navy and special units.

Competitor Comparison Table

Feature	M16A4	Hk416	Fn Scar
MSRP	$800–$1,200 (military pricing varies)	$2,200–$3,200	$2,700–$3,700
Capacity/Size	30-round 5.56 NATO	30-round 5.56 NATO	20 or 30-round 5.56 or 7.62 NATO
Weight	7.9 lbs (3.6 kg)	7.9 lbs (3.6 kg)	8.9 lbs (4.0 kg) 5.56 model
Optics-Ready	Yes, flat-top receiver	Yes, monolithic upper	Yes, integral rails
Trigger Type	Military standard single-stage	Enhanced single-stage	Single-stage with safety features
Notable Pro	Standard US military rifle since 2000s	Highly modular and reliable	Multi-caliber capable
Notable Con	Heavier and longer than newer carbines	Higher cost	More complex maintenance