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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 |
Best Use Cases
- Military and law enforcement duty
- Service rifle marksmanship competitions
- Range training and tactical drills
- Home defense with proper configuration
- Firearms collections featuring US military rifles
FAQs
Can I attach modern optics to the M16A4?
Yes, the flat-top upper receiver includes a Picatinny rail designed for various optics like red dots and scopes.
What cartridge does the M16A4 use?
It chambers the standard 5.56x45mm NATO cartridge, compatible with STANAG magazines.
How does the M16A4 differ from the M4 carbine?
The M16A4 has a longer barrel and fixed stock, while the M4 is shorter, lighter, and more compact for close quarters.
