AR57 ULT Upper Assembly 16" BBL – 5.7×28mm (ULT16 – ULT0116)
Experience unmatched precision and modular flexibility with the AR57 ULT Upper Assembly featuring a 16‑inch barrel and chambered for the high‑velocity 5.7×28mm cartridge. Engineered for both tactical and sporting applications, this upper assembly combines lightweight design with durable construction, delivering superior performance in a compact platform. Whether you're building a custom AR‑57 build or upgrading an existing system, the ULT16 delivers the reliability and accuracy demanded by discerning shooters.
Key Features & Benefits
- 16‑inch barrel length optimized for balanced handling and extended muzzle velocity.
- Specifically engineered for the 5.7×28mm cartridge, offering flat trajectory and reduced recoil.
- Precision‑machined ULTRA‑LIGHT (ULT) alloy for superior strength‑to‑weight ratio.
- Compatible with standard AR‑15 lower receivers and AR‑57 conversion kits.
- Enhanced heat‑dissipating design for sustained fire without loss of accuracy.
- Full‑length hand‑guard with M‑LOK slots for customizable accessory attachment.
- Integrated, low‑profile gas system for smooth cycling and minimal recoil impulse.
- Factory‑tested for reliability, ensuring flawless operation out of the box.
Technical Specifications
| Specification | Detail |
|---|
| Model | AR57 ULT Upper Assembly 16" |
| Barrel Length | 16 inches (406 mm) |
| Caliber | 5.7×28mm |
| Part Number | ULT16 – ULT0116 |
| Material | ULT‑grade aerospace aluminum alloy |
| Gas System | Adjustable direct‑impingement |
| Hand Guard | M‑LOK compatible, 15‑inch length |
| Weight (unloaded) | ≈ 3.2 lbs (1.45 kg) |
| UPC | 051497297985 |
| Country of Origin | United States |
Why Choose the AR57 ULT Upper Assembly?
The AR57 ULT Upper Assembly is more than a component—it’s a platform that expands the capabilities of the 5.7×28mm cartridge. Its lightweight yet robust construction makes it ideal for:
- Close‑quarters tactical scenarios where maneuverability matters.
- Competitive shooting disciplines that reward rapid follow‑up shots.
- Home defense setups that benefit from reduced recoil and high magazine capacity.
- Custom builds seeking a balance of performance and ergonomics.
Installation & Compatibility
Designed with the end‑user in mind, the upper assembly features a standard AR‑15 interface, allowing a quick swap onto any compatible lower receiver. The built‑in gas block aligns perfectly with standard gas tubes, and the M‑LOK hand guard supports a wide range of accessories, from foregrips to tactical lights. Follow the included installation guide for a seamless build experience.
Accessories & Upgrades
To maximize the potential of your AR57 ULT Upper Assembly, consider pairing it with:
- 5.7×28mm match‑grade ammunition for enhanced accuracy.
- Precision‑machined AR‑57 lower receivers.
- Adjustable gas blocks for fine‑tuning recoil impulse.
- M‑LOK compatible rail systems and accessories.
- Enhanced trigger groups for a smoother pull.
Customer Support & Warranty
Every AR57 ULT Upper Assembly is backed by a limited two‑year warranty covering manufacturing defects. Our dedicated support team is available to assist with any questions regarding installation, compatibility, or performance optimization.
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