Colt SOCOM Upper Receiver Kit 5.56 NATO 14.5" Heavy Barrel with KC Rail & Matech BUIS LE6921SOCOMCK – Premium Military-Grade Upper Assembly
The Colt SOCOM Upper Receiver Kit 5.56 NATO 14.5" Heavy Barrel with KC Rail & Matech BUIS (LE6921SOCOMCK) is a factory-original, high-performance upper receiver assembly based on the legendary Colt SOCOM configuration. This premium kit features a 14.5-inch heavy barrel chambered in 5.56 NATO, a Knights Armament Company (KC) rail system, and Matech backup iron sights. Designed to meet the rigorous demands of special operations forces, this upper delivers exceptional reliability, accuracy, and durability in a compact yet powerful package. The heavy barrel profile provides increased rigidity and sustained fire capability, while the included rail system and backup sights make this upper ready for a wide range of optics and accessories. Whether you’re building a high-end SBR, a professional-grade carbine, or a collector-grade SOCOM-style rifle, the Colt LE6921SOCOMCK offers authentic military specifications and premium components.
Engineered for those who demand the performance and features of a true SOCOM platform, this Colt upper receiver kit represents the pinnacle of factory-produced AR-15/M4 upper assemblies.
Key Features of the Colt SOCOM Upper Receiver Kit
14.5-Inch Heavy Barrel
Heavy contour 14.5-inch barrel provides superior rigidity, heat dissipation, and accuracy while maintaining a compact overall length.
Knights Armament Company Rail
Includes a genuine KC Rail system for secure mounting of optics, lights, lasers, and other accessories with excellent return-to-zero capability.
Matech Backup Iron Sights
Comes with Matech BUIS (Backup Iron Sights) for reliable backup sighting capability when optics are not in use or fail.
Why Choose the Colt SOCOM Upper Receiver Kit 5.56 NATO 14.5" Heavy Barrel?
When searching for a premium, military-inspired upper receiver kit with authentic SOCOM features, the Colt SOCOM Upper Receiver Kit (LE6921SOCOMCK) stands out as one of the most desirable options available. Colt has long been the gold standard for AR-15/M4 platforms used by the U.S. military, and the SOCOM configuration represents one of the most respected variants in the Colt lineup. The 14.5-inch heavy barrel is a defining characteristic of this upper. The heavy contour increases barrel stiffness, reduces barrel whip, and improves accuracy, especially during sustained fire. This barrel length also provides excellent ballistic performance in 5.56 NATO while keeping the overall length of the firearm more compact than a standard 16-inch carbine. When paired with a pinned and welded muzzle device (where required by law), this upper can be used to build a legal rifle without NFA registration. The inclusion of a Knights Armament Company (KC) rail is a major advantage. Knights Armament rails are widely regarded as some of the highest quality rail systems available, offering exceptional strength, modularity, and return-to-zero performance. This allows users to mount a wide variety of optics and accessories with confidence. The Matech backup iron sights provide a reliable secondary sighting system. These high-quality BUIS are designed to be low-profile when not in use and can be quickly deployed if the primary optic fails or is removed. Their inclusion makes this upper exceptionally well-rounded for both professional and civilian use. This upper receiver kit is manufactured to Colt’s exacting military specifications. It features a forged upper receiver, properly headspaced heavy barrel, and a gas system optimized for the 14.5-inch barrel length. The black finish provides excellent corrosion resistance and a professional appearance. This model is particularly well-suited for law enforcement professionals, military personnel, competitive shooters building SOCOM-style rifles, and serious enthusiasts who want authentic Colt components with premium rail and sighting systems. The combination of the 14.5-inch heavy barrel, KC Rail, Matech BUIS, and factory SOCOM configuration makes the LE6921SOCOMCK a top-tier choice for those seeking a high-performance, ready-to-mount upper receiver assembly. If you’re looking for a genuine Colt SOCOM Upper Receiver Kit with a 14.5-inch heavy barrel, Knights Armament rail, and Matech backup iron sights, the LE6921SOCOMCK delivers the quality, performance, and authenticity that Colt is known for.
- Colt SOCOM Upper Receiver Kit
- Chambered in 5.56 NATO
- 14.5-Inch Heavy Barrel
- Knights Armament Company (KC) Rail
- Matech Backup Iron Sights (BUIS)
- Forged Upper Receiver
- Black Finish
- Designed for SOCOM-Style Builds
- Authentic Colt Manufacturing
- Model: LE6921SOCOMCK | UPC: 098289035660
Technical Specifications – Colt SOCOM Upper Receiver Kit
| Specification | Details |
|---|
| Brand | Colt |
| Model | SOCOM Upper Receiver Kit |
| SKU | LE6921SOCOMCK |
| UPC | 098289035660 |
| Caliber | 5.56 NATO |
| Barrel Length | 14.5 Inches (Heavy Contour) |
| Rail System | Knights Armament Company (KC Rail) |
| Backup Sights | Matech BUIS |
| Finish | Black |
| Key Features | Heavy Barrel, KC Rail, Matech BUIS, SOCOM Configuration |
| Best For | SBR Builds, Tactical Use, Professional Applications |
Shop the Colt SOCOM Upper Receiver Kit LE6921SOCOMCK today.
The Colt SOCOM Upper Receiver Kit 5.56 NATO 14.5" Heavy Barrel with KC Rail & Matech BUIS (LE6921SOCOMCK) is a factory-original upper assembly featuring a 14.5-inch heavy barrel, Knights Armament Company rail, and Matech backup iron sights. Designed for building high-performance SOCOM-style rifles and SBRs, this premium Colt upper delivers exceptional quality, reliability, and military-grade features. Model: LE6921SOCOMCK | UPC: 098289035660.
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