The next evolution of Colt's established carbine platform, the EPR II blends proven TDP components with certified MIL-SPEC materials, coatings, finishes, and proprietary processes - ensuring every EPR II is built to professional standards for reliable performance across a wide range of conditions. The Colt free-float rail features Magpul M-LOK slots, a full-length MIL-STD-1913 Picatinny top rail, and seven M-LOK mounting orientations for maximum attachment flexibility. Anti-rotation tabs and two integrated steel QD sling swivel sockets complete this rigid, lightweight system. Suppressor-ready and available in multiple barrel lengths, the EPR II is a configurable, high-performance platform built for demanding operational environments. Key Features (Both Models) Colt Chrome-Lined Barrel - Rigid material, process, and QC standards backed by decades of experience, delivering accurate and reliable performance under high heat, heavy use, and extreme conditions. Colt Bolt Carrier Group - Built to meet and exceed MIL-SPEC standards. Proprietary bolt heat-treat process delivers enhanced wear resistance and extended service life. MIL-SPEC Finishes - Certified MIL-SPEC finishes provide consistent corrosion and wear resistance across all components for long-term durability in demanding environments. Individual HP & MPI Inspection - Every bolt, barrel, and barrel extension undergoes High Pressure Testing and Magnetic Particle Inspection to ensure safety and reliability under real-world conditions. Quick-Reference Specs (Both Models) Caliber 5.56x45mm NATO / .223 Remington Barrel Twist Rate 1:7 RH (Right Hand), 6 Groove Capacity 30 Rounds Made in USA Yes - Colt's Manufacturing, West Hartford, CT Receiver Material MIL-SPEC Forged 7075-T6 Aluminum Barrel Material CrMoV Steel (Chrome Moly Vanadium), Chrome-Lined Threaded Yes Thread Pitch 1/2x28 Barrel Length 11.5" (292.1 mm) Full Specifications (Both Models) Caliber 5.56x45mm NATO Receiver Material MIL-SPEC Forged 7075-T6 Aluminum Receiver Finish MIL-SPEC Matte Black Type-III Hard Coat Anodize Bolt Carrier Group MIL-SPEC Chrome-Lined / Manganese Phosphate Finish, HP/MPI Tested Trigger MIL-SPEC Barrel Colt Spec CrMoV Steel, Manganese Phosphate Finish, Chrome-Lined, HP/MPI Tested Barrel Length 11.5" (292.1 mm) Rifling 1:7 RH, 6 Groove Operating System Carbine-Length Direct Impingement Handguard Colt 10.5" Free Float w/ Magpul M-LOK and Steel QD Sockets Stock Magpul MOE SL 6-Position Selector Ambidextrous Magazine Magpul PMAG 30-Round Fire Mode Semi-Auto (Safe/Semi) Overall Length 28.5" (723.9 mm) - 31.7" (805.2 mm) Pro vs. Standard - What's Different ComponentEPR II ProEPR II Standard Charging Handle Radian Raptor(TM) Ambidextrous MIL-SPEC Sights Magpul MBUS ProA(R) (steel, low-profile) Magpul MBUSA(R) 3 (polymer) Grip Magpul MOE-K2A(R) MIL-SPEC A2 Magazine Catch Ambidextrous MIL-SPEC Receiver End Plate QD Sling Swivel Socket MIL-SPEC Weight 6.1 lbs (2.8 kg) 6.0 lbs (2.7 kg) UPC 098289116345 098289116338 EPR II Pro - Upgrade Notes Radian Raptor(TM) Charging Handle - Large, ambidextrous latches for fast, positive manipulations from either side. Magpul MBUS ProA(R) Sights - Low-profile steel flip sights that sit flush to the rail, more durable and snag-resistant than standard polymer sights. Magpul MOE-K2A(R) Grip - More ergonomic grip angle with palm swell for improved control and comfort. Ambidextrous Magazine Catch - Completes the ambidextrous control package alongside the ambi safety selector. QD Receiver End Plate - Integrated quick-detach sling socket at the rear of the receiver for a clean, built-in sling attachment point.