Elevate Your Tactical Platform: The Knights Armament SR-15 CQB MOD 2 11.5" Upper Receiver Kit

For discerning firearms enthusiasts, tactical professionals, and anyone who demands uncompromising reliability and performance from their AR-style platform, the Knights Armament SR-15 CQB MOD 2 Upper Receiver Kit stands as a benchmark of engineering excellence. This complete upper receiver is not just an assembly of components; it's a testament to Knight's Armament's legacy of innovation and dedication to military-grade specifications. If you're searching for "the best upper receiver for an SR-15," "a durable 5.56 NATO upper," or "how to enhance AR-15 reliability," this comprehensive guide will illuminate why the KAC SR-15 CQB MOD 2 11.5" Upper is the definitive choice for your needs.

Unpacking Elite Performance: What Makes the KAC SR-15 CQB MOD 2 Upper Stand Out?

This Knights Armament Upper Receiver Kit is meticulously engineered to provide superior performance, especially in close-quarters battle (CQB) environments, while maintaining the versatility for various tactical and recreational applications. Its 11.5-inch barrel length strikes an optimal balance between maneuverability and ballistic performance for the 5.56x45mm NATO cartridge. But it's the combination of Knight's proprietary technologies that truly sets this upper apart.

• Optimized for Versatility and Agility: The 11.5" barrel is a prime example of thoughtful design. This length is highly sought after by law enforcement and military units for its effectiveness in confined spaces, allowing for quick transitions and improved handling. For the civilian user, this translates to a carbine that is incredibly maneuverable, whether in a tactical scenario, during a competition, or for home defense. It offers a significant advantage over longer barrels in situations where every inch counts, without excessively sacrificing projectile velocity, making it ideal for the 5.56mm NATO round.
• Military-Grade Durability with a Chrome-Lined Barrel: At the heart of this upper is a 11.50" chrome-lined steel barrel, manufactured to withstand the most rigorous use. The chrome lining provides exceptional resistance to wear, corrosion, and heat buildup, dramatically extending the barrel's lifespan and ensuring consistent accuracy under sustained fire. This feature is paramount for those who demand longevity and unwavering performance, mirroring the specifications found in combat-proven firearms. The 1:7" twist rate is optimized to stabilize a wide range of 5.56x45mm NATO ammunition, including heavier grain projectiles commonly used in tactical applications.
• The Revolutionary E3 Round-Lug Bolt Design: Knight's Armament's proprietary E3 round-lug bolt is a game-changer. Unlike traditional AR bolts, the E3 design features radiused lugs that distribute impact forces more evenly, significantly reducing stress on the bolt and barrel extension. This innovation not only enhances the overall function and reliability of the system but also dramatically increases the bolt's service life, far surpassing that of industry-standard designs. For users who prioritize unwavering reliability and minimal downtime, the E3 bolt offers a clear advantage, ensuring your firearm operates flawlessly when it matters most. This is a critical factor for anyone asking, "How can I make my AR-15 more reliable?"
• The URX4 M-LOK Handguard: Superior Ergonomics and Accessory Integration: The free-floated URX4 M-LOK handguard encapsulates the barrel, ensuring that no external pressure affects barrel harmonics, which is crucial for maintaining accuracy. The M-LOK (Modular Lock) system provides a lightweight and robust interface for attaching a wide array of accessories, from lights and lasers to vertical grips and bipods, allowing for complete customization to suit any mission profile or personal preference. Its slim profile and comfortable ergonomics enhance handling and reduce fatigue, especially during extended periods of use. This handguard design is known for its strength-to-weight ratio and is a preferred choice for professionals who rely on their equipment.
• Advanced Flash Suppression: The 3-Prong Flash Eliminator: The included 5.56mm 3-Prong Flash Eliminator is engineered to significantly reduce muzzle flash signature by interfering with propellant gas combustion forward of the muzzle. This is vital for maintaining an operator's night vision and reducing their visible signature in low-light conditions. A key benefit of this design is that it "will not ring upon firing or when struck," eliminating an annoying and potentially revealing sound often associated with some flash hiders. Furthermore, it boasts seamless compatibility with the Knights Armament line of 5.56mm QDC (Quick Detach Coupling) Signature Reduction Devices, allowing for rapid attachment and detachment of suppressors without tools.

Who Benefits Most from the Knights Armament SR-15 CQB MOD 2 Upper?

This upper receiver kit is designed for a specific clientele who prioritize uncompromised quality, durability, and performance.

• Law Enforcement and Military Personnel: Given its "military-grade durability" and "chrome-lined barrel manufactured for military grade durability," this upper is an ideal choice for professionals who operate in demanding environments. Its reliability, flash suppression, and suppressor compatibility make it a top-tier option for duty use.
• Competitive Shooters: For those engaged in 3-Gun, tactical carbine, or other shooting sports where speed, accuracy, and reliability are paramount, the KAC SR-15 CQB MOD 2 upper offers a competitive edge. The excellent recoil characteristics, the E3 bolt's consistent cycling, and the free-floated barrel contribute to superior performance.
• Discerning Civilian Enthusiasts and Home Defenders: If you're building a top-tier AR-15 or upgrading an existing SR-15 CQB MOD 2, and you seek the ultimate in reliability, longevity, and advanced features, this upper receiver is an investment in unparalleled quality. For home defense, its compact size and effective flash suppression are significant advantages.
• SBR (Short Barreled Rifle) Builders: The 11.5-inch barrel length makes this upper an excellent foundation for a legally registered Short Barreled Rifle, providing compact dimensions without severe velocity degradation for the 5.56x45mm NATO cartridge.

Why Choose Knights Armament? A Legacy of Excellence

Knights Armament Company (KAC) is globally recognized for its commitment to engineering innovative and high-performance firearms and accessories. With a rich history of serving military and government agencies worldwide, KAC products are synonymous with reliability, precision, and combat-proven durability. When you choose a Knights Armament product, you're not just acquiring a component; you're investing in decades of research, development, and real-world application. Their reputation for pushing the boundaries of AR-platform technology, as exemplified by features like the E3 bolt and URX4 handguard, solidifies their position as a leader in the firearms industry. This commitment to excellence ensures that KAC products consistently exceed "industry standard" performance metrics.

Key Advantages and Features at a Glance:

• Unrivaled Reliability: The E3 round-lug bolt design significantly extends bolt life and enhances functional reliability far beyond standard AR-15 bolts.
• Exceptional Durability: Chrome-lined, military-grade barrel and robust aluminum receiver ensure longevity even under extreme conditions.
• Superior Maneuverability: The 11.5" barrel is perfect for close-quarters operations, vehicle deployment, or compact storage.
• Advanced Accessory Integration: The URX4 M-LOK handguard offers a versatile, lightweight, and secure platform for all your tactical attachments.
• Effective Flash Suppression: The 3-Prong Flash Eliminator reduces signature and is compatible with Knight's QDC suppressors.
• Comprehensive Package: Comes as a complete upper, including flip-up front and rear sights for immediate usability.

This Knights Armament SR-15 CQB MOD 2 11.5" Upper Receiver Kit (Part Number 31963, UPC 819064015970) represents an elite choice for those who cannot compromise on quality, performance, or reliability. It is a testament to what an AR-style platform can achieve when engineered with precision and a dedication to surpassing the most demanding expectations.

Technical Specifications: Knights Armament SR-15 CQB MOD 2 Upper Receiver Kit

Feature	Specification	Details
Brand	Knights Armament	Renowned for military-grade firearms and components
Model	Upper Receiver Kit	Complete upper for SR-15 CQB MOD 2 platform
Caliber	5.56x45mm NATO	Standardized military cartridge for versatility
Barrel Length	11.50"	Optimal for CQB and maneuverability
Barrel Finish	Black	Durable and non-reflective finish
Barrel Material	Chrome Lined Steel	Enhances durability, corrosion resistance, lifespan
Barrel Twist	1:7"	Stabilizes wide range of 5.56mm NATO projectiles
Muzzle Device	3-Prong Flash Eliminator	Significantly reduces flash, QDC suppressor compatible
Handguard	URX4 M-LOK	Free-floated for accuracy, versatile accessory attachment
Receiver Material	Aluminum	Lightweight yet robust construction
Receiver Finish	Black	Standard tactical finish
Sights	Flip Up Front & Rear	Included for immediate use and backup
Gun Platform	AR-Style	Compatible with standard AR lower receivers
Firearm Fit	SR-15 CQB MOD 2	Specifically designed for this KAC platform
Type	Complete	Ready for installation and use
Weight	3.80 lbs	Balanced for agility and handling
SKU	127169	Stock Keeping Unit
UPC	819064015970	Universal Product Code
MPN	31963	Manufacturer Part Number