Colt's Manufacturing, LE6933EPRII, Upper Receiver, 5.56 NATO, 11.5" Barrel, Fits AR-15/M4 Lower Receivers, Matte Finish, Black - SKU: LE6933-EPRII-CK - UPC: 098289035646
Product Description
The Colt LE6933EPRII Complete Upper Receiver Assembly (LE6933-EPRII-CK) is the enhanced tactical evolution of Colt’s legendary 11.5-inch M4 Commando carbine platform. Engineered to meet rigorous law enforcement and duty requirements, the Enhanced Patrol Rifle (EPR) Series II upper pairs Colt’s mil-spec forged receiver with a modern Centurion Arms free-float M-LOK handguard, delivering superior ergonomics, thermal dissipation, and mounting real estate.
At its core, the LE6933EPRII features an 11.5-inch 4150 CMV chrome-lined barrel with a 1:7" twist rate, offering optimal ballistic velocity, bullet stabilization for heavy grain 5.56 NATO projectiles, and exceptional barrel life under sustained automatic or rapid-fire schedules. The carbine-length gas system is paired with a low-profile gas block tucked cleanly beneath the lightweight M-LOK rail system, creating a continuous top Picatinny rail section for optics, lasers, and iron sights.
This factory-assembled conversion kit ships complete with a genuine Colt full-auto profile chrome-lined bolt carrier group (BCG), standard charging handle, and A2 flash hider, providing a true drop-in short-barreled rifle (SBR) or AR-pistol upper solution.
*Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Direct drop-in fit for standard MIL-SPEC AR-15 / M4 lower receivers (.250" pivot/takedown pin holes). Designed for legally registered Short-Barreled Rifles (SBRs) or AR-15 pistol lower receivers.
- Verify host lower receiver is completely clear, magazine removed, and chamber visually and physically confirmed empty.
- Lubricate bolt carrier group guide rails, cam pin slot, and upper receiver tracking channels generously prior to installation.
- Align front pivot pin hole of the LE6933EPRII upper receiver with the lower receiver pivot boss and slide the pivot pin through to lock.
- Pivot upper receiver down onto the lower receiver assembly and press the rear takedown pin firmly into place to secure lockup.
- Perform a full manual cycle and dry-fire function test (checking safety selector, bolt catch hold-open, and forward assist action) before staging for live fire.
Key Features
- 11.5" Chrome-Lined 4150 CMV Barrel: Optimized for close-quarters maneuverability, terminal ballistics, and high-heat durability.
- Centurion Arms M-LOK Free-Float Rail: Lightweight aluminum handguard allows direct accessory mounting at 3, 6, and 9 o'clock positions.
- Genuine Colt Full-Auto BCG: Factory-included 8620 carrier with 158 Carpenter steel bolt, chrome-lined bore, and properly staked gas key.
- 1:7" Twist Rate Alignment: Accurately stabilizes heavy-grain tactical ammunition including 62gr M855 and 77gr OTM loads.
- MIL-SPEC Forged Upper Receiver: 7075-T6 aluminum construction featuring M4 feed ramps, laser-etched T-marks, forward assist, and ejection port cover.
- Low-Profile Gas Block Architecture: Ensures clean clearance beneath the extended handguard while maintaining reliable gas port cycling.
Product Specifications
- Brand: Colt's Manufacturing
- MPN: LE6933-EPRII-CK
- SKU: LE6933-EPRII-CK
- UPC: 098289035646
- Caliber: 5.56x45mm NATO / .223 Remington
- Barrel Length: 11.5 Inches
- Gas System: Carbine-Length with Low-Profile Gas Block
- Twist Rate: 1:7" RH
- Barrel Finish: Manganese Phosphate / Chrome-Lined Bore
- Handguard: Free-Float Centurion Arms M-LOK Rail
- BCG Included: Yes (Factory Colt Full-Auto Profile)
- Receiver Finish: Matte Black Hardcoat Anodized
