Colt LE6933-EPRII-PRO-SF3-CK 5.56 NATO 11.5" Upper Receiver Conversion Kit with SureFire SF3FH Flash Hider (UPC 098289035707)

The Colt LE6933-EPRII-PRO-SF3-CK 5.56 NATO 11.5" Upper Receiver Conversion Kit with SureFire SF3FH Flash Hider (UPC 098289035707) is a premium, factory-assembled upper receiver designed for professional users and serious shooters who demand the highest level of performance from their AR-15 platform. This Enhanced Patrol Rifle G2 Pro conversion kit features a true 11.5-inch barrel and comes equipped with the SureFire SF3FH 3-prong flash hider, which provides exceptional flash suppression and serves as a quick-detach mount for SureFire SOCOM series suppressors. The “Pro” designation signifies that this upper includes upgraded components and refinements specifically chosen for law enforcement, military contractors, and tactical professionals. Built to Colt’s exacting standards, this conversion kit allows owners of compatible lower receivers to easily upgrade to a compact, suppressor-ready 11.5" configuration with professional-grade reliability and features.

This upper receiver conversion kit represents the top tier of Colt’s Enhanced Patrol Rifle lineup, combining the compact advantages of an 11.5-inch barrel with modern suppressor mounting technology and enhanced internal components developed from real-world operator feedback.

11.5-Inch Barrel for Maximum Maneuverability

The 11.5-inch barrel is the centerpiece of this conversion kit. This barrel length dramatically reduces the overall length of the rifle compared to standard 16-inch carbines, making it ideal for close-quarters battle, vehicle operations, and confined space work. Despite the shorter barrel, the 11.5" length maintains excellent terminal ballistics with 5.56 NATO ammunition at typical engagement distances. The gas system has been properly tuned at the factory for reliable function with this barrel length, ensuring consistent cycling whether the rifle is used suppressed or unsuppressed.

SureFire SF3FH 3-Prong Flash Hider

This conversion kit comes equipped with the SureFire SF3FH 3-prong flash hider. This premium muzzle device is widely regarded as one of the most effective and durable flash hiders available. It provides outstanding flash suppression when the rifle is used without a suppressor and serves as the mounting interface for SureFire SOCOM series suppressors. The SF3FH is constructed from high-strength steel and features a robust design that maintains alignment and performance even after thousands of rounds. Its quick-detach capability allows operators to rapidly attach or remove a suppressor in the field without tools, making this upper an excellent choice for professionals who frequently transition between suppressed and unsuppressed configurations.

Enhanced Patrol Rifle G2 Pro Upgrades

The “Pro” model includes several upgraded components not found on standard Enhanced Patrol Rifle uppers. These enhancements typically include a premium bolt carrier group, optimized gas system components for short-barrel reliability, an improved extractor, and other high-reliability parts chosen specifically for demanding professional use. The G2 Pro configuration reflects Colt’s ongoing development based on extensive feedback from law enforcement and military users, resulting in improved durability, smoother operation, and greater overall reliability under extreme conditions.

Factory-Assembled Quality and Reliability

Unlike aftermarket upper builds, the LE6933-EPRII-PRO-SF3-CK is assembled at the Colt factory under strict quality control standards. Every upper is properly headspaced, timed, and function-tested before leaving the facility. This level of quality control is especially critical in short-barreled configurations, where gas system tuning and component fitment directly impact reliability. Users can install this upper with confidence knowing it meets Colt’s rigorous performance standards right out of the box.

Ideal Applications

• Converting a standard lower into a professional 11.5" SBR
• Law enforcement patrol and SWAT team rifles
• Close-quarters battle and vehicle operations
• Suppressed shooting with SureFire SOCOM suppressors
• Professional security and contractor use
• High-reliability duty and training rifles

Why Choose the Colt LE6933-EPRII-PRO-SF3-CK?

• Factory-assembled 11.5" upper with SureFire SF3FH flash hider
• Enhanced Patrol Rifle G2 Pro upgrades for maximum reliability
• Quick-detach suppressor mounting with SureFire SOCOM compatibility
• Properly tuned gas system for short barrel performance
• Proven Colt quality control and engineering
• Black finish for a professional, non-reflective appearance
• Compatible with Colt and mil-spec lower receivers

The Colt LE6933-EPRII-PRO-SF3-CK 5.56 NATO 11.5" Upper Receiver Conversion Kit with SureFire SF3FH Flash Hider (UPC 098289035707) is a top-tier factory upper receiver designed for professionals who require the highest levels of performance and reliability. Featuring an 11.5-inch barrel and the SureFire SF3FH 3-prong flash hider, this conversion kit allows users to transform their existing lower receiver into a compact, suppressor-ready platform. The Enhanced Patrol Rifle G2 Pro configuration includes upgraded components specifically chosen to meet the rigorous demands of law enforcement and tactical operations. Whether you’re a law enforcement officer, military contractor, or serious shooter looking to add a high-quality 11.5" upper to your collection, this Colt conversion kit delivers exceptional build quality, modern suppressor compatibility, and the legendary reliability that has made Colt the trusted choice for professionals worldwide. Its combination of factory assembly, G2 Pro enhancements, and SureFire SF3FH technology makes the LE6933-EPRII-PRO-SF3-CK one of the most complete and capable 11.5" upper receiver conversion kits available today.

Upgrade to professional-grade performance with the Colt Enhanced Patrol Rifle G2 Pro 11.5" Upper Conversion Kit.