Description
The Windham Weaponry M4 A3 AR-15 SA 223/5.56 16″ Barrel, 6 Pos Stock Black, 30rd is a direct-gas-impingement semi-automatic rifle built to classic M4 specifications. It’s a reliable, no-frills platform ready for duty, training, or defense right out of the box, offering proven performance at a competitive price point of $933.13.
Key Features
- Mil-Spec Foundation: Built with a forged 7075-T6 aluminum upper and lower receiver for durability.
- 16″ Chrome-Lined Barrel: Provides a balance of maneuverability and velocity, with a 1:9 twist rate stabilizing a wide range of .223 and 5.56mm ammunition.
- Six-Position Collapsible Stock: Adjusts for armorer length of pull, from compact storage to full gear.
- Drop-In Ready: No gunsmithing required. The rifle ships with a 30-round magazine and is ready for optics, lights, and sling attachments.
- Direct Gas Impingement System: A time-tested, simple operating system known for reliability and ease of maintenance.
Specifications & Details
| Specification | Detail |
|---|---|
| Caliber | .223 Remington / 5.56x45mm NATO |
| Barrel Length | 16 inches |
| Barrel Twist | 1:9 inches |
| Overall Length (Stock Extended) | Approx. 35.5 inches |
| Weight (Unloaded) | Approx. 6.8 lbs |
| Magazine Capacity | 30 Rounds (1 included) |
This rifle is built by Windham Weaponry, a company founded by the original Bushmaster team, so you’re getting lineage and know-how in every component. The fit and finish are solid, with a hard-coat anodized finish on the receivers and a phosphate-coated barrel. The handguard is a classic round M4-style, offering a familiar grip and plenty of real estate for a forward hand stop or vertical grip. At just under 7 pounds unloaded, it’s light enough for extended patrols or carbine courses without feeling toy-like. The 1:9 twist rate is a versatile middle ground—it’ll handle everything from lighter 55-grain training rounds to heavier 62-grain loads effectively. Here’s the thing—when it comes to home defense, you want a system that works without a second thought, and this M4 A3 delivers that fundamental reliability.
Who This Rifle Is For
This Windham Weaponry AR-15 is for the shooter who values proven function over flash. It’s the ideal first AR for a Missouri resident wanting a dependable home defense tool, a robust trainer for competitive shooters looking to log thousands of rounds, or a trusted backup for a hunter managing predator populations. It’s a rifle that serves as a perfect baseline—you can run it as-is for years, or use its mil-spec compatibility as a foundation for incremental upgrades. The platform accepts a vast universe of standard AR-15 parts and accessories, from triggers and charging handles to optics and weapon lights from brands like Magpul, BCM, and Vortex.
Pros & Cons
Pros: Built by a heritage manufacturer with a strong reputation. Uses a reliable, simple operating system. Excellent out-of-the-box reliability with no tuning needed. Fully mil-spec compatible for easy customization. The 16-inch barrel makes it a practical choice for both vehicle and home use without NFA paperwork. Ships to Missouri and compliant US states.
Cons: The classic handguard can get hot during sustained fire. The 1:9 twist may not optimally stabilize the very heaviest bullets (over 75 grains). It’s a basic configuration, so expect to add your own preferred sights, optic, and sling. That said, starting with a solid foundation is always better than starting with a gimmick.
Frequently Asked Questions
Q: Does this rifle come with sights?
A: No, it does not. The upper receiver has a standard flat-top Picatinny rail for mounting your choice of iron sights or optics. This allows you to select the sighting system that best fits your needs and budget from the start.
Q: Is the barrel chambered for 5.56 NATO or .223 Remington?
A: The barrel is chambered for 5.56x45mm NATO, which means it can safely fire both 5.56mm and .223 Remington ammunition. This gives you maximum flexibility when sourcing ammo. The rifle weighs approximately 6.8 pounds without a magazine, making it easy to handle for most shooters.
Q: What is included with the rifle?
A: The rifle ships with one 30-round magazine. It does not include iron sights, an optic, a sling, or a case. Remember, an FFL transfer is required for firearm purchases, so coordinate with your local dealer when ordering. This model is available at firearms-missouri.com for Missouri residents and nationwide.
Ready to add this dependable, American-made AR-15 platform to your safe.



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