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Colt LE6920 EPR II Complete Upper Receiver Conversion Kit 5 56 NATO 16 1 Inch Barrel M LOK MBUS 3 Black LE6920 EPRII CK UPC 098289035622
Product Description
The Colt's Manufacturing® LE6920 EPR II 16.1-Inch 5.56 NATO Complete Upper Receiver Conversion Kit (SKU: LE6920-EPRII-CK / UPC: 098289035622) delivers the pinnacle of duty-grade reliability, built to the exact specifications demanded by patrol officers, tactical professionals, and defensive shooters alike. As the second generation of Colt's Enhanced Patrol Rifle architecture, this factory-assembled upper group brings the legendary performance of the combat-proven M4 platform into a modern, free-floating layout designed to maximize weapon control and repeatable mechanical accuracy without sacrificing harsh-environment durability.
Every component is manufactured to uncompromising military standards. The flat-top upper receiver is hot-forged from 7075-T6 aircraft-grade aluminum, precision CNC-machined with true M4 extended feed ramps, and treated with a MIL-A-8625 Type III Class 2 hardcoat anodized finish to ensure lifelong resistance to galvanic corrosion, abrasive grit, and aggressive chemical solvents. Beneath the handguard, Colt installs a 16.1-inch 4150 Chrome-Moly Vanadium (CMV) steel barrel featuring a 1:7-inch right-hand twist rate and an M4/Government contour. The barrel bore and chamber are fully hard chrome-lined to withstand sustained high-cadence firing schedules and harsh thermal cycles, while the exterior is protected by a heavy Mil-Spec manganese phosphate parkerization.
Operational modularity is anchored by Colt's updated Gen II slimline aluminum free-float handguard, which isolates barrel harmonics from bipod loading, forward barricade pressure, and high-tension sling configurations. Seven rows of M-LOK attachment slots provide rigid real estate for weapon lights, foregrips, and remote switches, flanked by an uninterrupted full-length top 1913 Picatinny rail. Out of the box, the LE6920-EPRII-CK conversion kit arrives fully staged and ready for service, complete with a factory-headspaced Colt M16 full-auto bolt carrier group, forged charging handle, and low-profile Magpul® MBUS 3 folding front and rear backup iron sights.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Direct drop-in interface for all Mil-Spec AR-15 and M4 semi-automatic lower receivers utilizing 0.250-inch takedown and pivot pin holes. Chambered in 5.56x45mm NATO (safely runs .223 Remington). CRITICAL: Not compatible with AR-10/SR-25 large-frame lower receivers. Vintage Colt civilian lowers featuring 0.315-inch front pivot pins require an eccentric offset adapter pin. When servicing or swapping the factory A2 flash hider (threaded 1/2x28 TPI), always support the barrel with an internal spline tool (such as a reaction rod) rather than clamping the forged receiver shell; torque to 15-20 ft-lbs against a new crush washer. Apply blue threadlocker (Vibra-Tite 121 or Loctite 242) to M-LOK accessory fasteners and torque to 35 in-lbs into aluminum or 15 in-lbs into polymer.
- Ensure the host firearm is completely clear, magazine removed, and chamber visually and physically verified empty.
- Push out the rear takedown pin and front pivot pin on your host lower receiver, removing and setting aside any existing upper receiver assembly.
- Inspect the Colt LE6920-EPRII-CK conversion group, ensuring the bolt carrier group cam pin is properly clocked, the bolt is extended forward in the unlocked position, and the forged charging handle is fully latched into the upper receiver notch.
- Align the front pivot lug of the upper receiver with the lower receiver's front pin tabs, push the 0.250-inch front pivot pin completely home, swing the upper down onto the lower, and push the rear takedown pin fully closed.
- Cycle the action vigorously by hand to confirm seamless buffer and action spring engagement, verify positive bolt lock on an empty magazine, and perform a comprehensive dry-fire function check including trigger reset and safety selector mechanics before live-fire staging.
Key Features
- Factory Assembled Complete Conversion Kit: Arrives 100% turnkey with a headspaced Colt M16 bolt carrier group, charging handle, and Magpul MBUS 3 iron sights for immediate drop-in deployment.
- Chrome-Lined 4150 CMV Barrel: Heavy-duty 16.1-inch Government-profile barrel with full chrome lining in the bore and chamber provides elite throat-erosion resistance and maximum service longevity.
- 1:7-Inch Twist Stabilization: Mil-Spec rifling pitch flawlessly stabilizes a full spectrum of combat projectiles, from standard 55-grain M193 balls to heavy 77-grain OTM/Sierra MatchKing duty rounds.
- Free-Floating Gen II M-LOK Rail: Rigid slimline aluminum handguard isolates the barrel assembly to eliminate point-of-impact shift under load while providing versatile attachment points at 3, 6, and 9 o'clock.
- Forged 7075-T6 Receiver: Built with true M4 extended feed ramps, laser-etched T-markings, forward assist, and a steel dust cover under Type III Class 2 hardcoat anodization.
- Colt Mil-Spec Full-Auto BCG: Features an 8620 steel carrier, Carpenter 158 steel bolt, high-pressure testing (HPT), magnetic particle inspection (MPI), and staked Grade 8 gas key screws.
Product Specifications
- Brand: Colt's Manufacturing®
- Model/Series: LE6920 EPR II (Enhanced Patrol Rifle Gen 2) Upper Receiver Conversion Kit
- MPN / SKU: LE6920-EPRII-CK / CTLE6920-EPRII-CK
- UPC: 098289035622
- Caliber / Chambering: 5.56x45mm NATO (.223 Rem compatible)
- Barrel Length: 16.1 Inches (40.89 cm)
- Barrel Metallurgy & Lining: 4150 Chrome-Moly Vanadium (CMV) Steel, Hard Chrome-Lined Bore and Chamber
- Barrel Contour: M4 / Government Profile
- Rifling Twist Rate: 1:7" Right-Hand, 6-Groove
- Gas System: Carbine-Length Direct Impingement with Pinned Low-Profile Gas Block
- Muzzle Device & Thread Pitch: Mil-Spec A2 Flash Hider, 1/2x28 TPI
- Upper Receiver Metallurgy: Forged 7075-T6 Aluminum with M4 Feed Ramps
- Surface Finish: MIL-A-8625 Type III Class 2 Hardcoat Anodized (Matte Black) / Manganese Phosphate Barrel
- Handguard System: Colt Gen II Free-Float Aluminum Slimline M-LOK Handguard
- Sighting System: Magpul® MBUS 3 Folding Front and Rear Polymer Sights
- Bolt Carrier Group: Mil-Spec Complete M16 Full-Auto Profile BCG, Carpenter 158 Bolt, HPT/MPI
- Charging Handle: Standard Mil-Spec Forged Aluminum Charging Handle
- Platform Compatibility: Standard Mil-Spec AR-15 / M4 Lower Receivers (0.250" Pin Diameter)
- Country of Origin: United States of America (USA)
