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Colt LE6920-EPRII-PRO Upper Receiver Group - Enhanced Patrol Rifle Pro, 5.56 NATO, 16.1" Chrome-Lined Barrel, Centurion Arms M-LOK Rail, Complete Bolt Carrier Group & Charging Handle - LE6920-EPRII-PRO-CK
Product Description
Upgrading your primary duty carbine or modular AR-15 build to achieve uncompromising field reliability requires an upper receiver group engineered to performance law enforcement standards. Consumer-grade uppers built with thin unlined barrels or loose handguard clamps often suffer from rapid throat erosion under high round counts and heat-induced rail twist, ruining your downrange accuracy on your bench. The **Colt® LE6920-EPRII-PRO Enhanced Patrol Rifle Upper Receiver Group (LE6920-EPRII-PRO-CK)** completely flatlines these tactical vulnerabilities. It delivers a direct-impingement factory assembly built to withstand heavy operation.
Proudly engineered, assembled, and performance-certified by Colt's Manufacturing, this premium complete upper core features a **16.1-inch government profile barrel** forged from heavy mil-spec carbon steel and treated with a **hard chrome lining**. The standout architectural enhancement is the integration of the **Centurion Arms® M-LOK® handguard**. This slim, free-floating structural rail system eliminates accuracy-robbing barrel pressure while offering seven planes of modular attachment surface and a full-length top Picatinny rail. At its mechanical center, the upper includes a genuine, high-integrity **Colt bolt carrier group (BCG)** that is magnetic particle inspected (MPI) to guarantee absolute lockup under extreme cycling pressures.
Arriving fully assembled out of the box with a standard A2 flash hider, mid-length gas system block tracking, and a tactical manual charging handle, this turn-key armorer asset transforms any mil-spec lower receiver right on your workbench.
*Armorer Bench Notes & Real-World System Staging Guidance: The Colt LE6920-EPRII-PRO-CK conversion kit arrives fully factory-assembled and workspace ready, containing the complete upper receiver housing, the free-floated M-LOK handguard, a factory-tested complete Colt bolt carrier group, a standard charging handle manual assembly, and a pre-installed A2 birdcage flash hider. UNIVERSAL MIL-SPEC AR-15 LOWER INTERFACE MATRIX: This complete upper group is engineered natively, strictly, and cross-compatibly to pin directly onto **any standard mil-spec AR-15 / M4 / rifle lower receiver chassis**. *Receiver Push-Pin Metrics:* It utilizes standard 0.250-inch front pivot and rear takedown pin channels. Chamber & Ammunition Tracking Standard: The barrel features a true **5.56x45mm NATO duty chamber**, allowing it to safely cycle both full-power mil-spec 5.56 NATO cartridges (such as M855 green-tip or MK262 match loads) and standard commercial .223 Remington ammunition on your bench. Armorer Workbench Staging Sequence: 1. Visually and physically confirm your host lower receiver is completely clear of live ammunition, the magazine is removed, and the internal hammer is safe in the cocked position. 2. Push out both the front pivot and rear takedown pins on your lower receiver until they hit their internal detent stops. 3. Lightly coat the lower lug tabs of the Colt upper receiver with high-quality gun oil. 4. Align the upper receiver's front pivot lug within the lower receiver's front pocket slots and push the front pin fully home to capture the assembly. 5. Pivot the upper receiver downward flat against the lower receiver chassis, align the rear lug pocket, and press the rear takedown pin inward until flush. 6. Pull the charging handle fully rearward manually to verify smooth bolt tracking and check proper trigger-to-sear functional lockup on your bench before firing downrange.*
Key Features
- Authentic Colt Duty Core: Built directly on Colt's heavy-duty forging lines to deliver the exact structural durability and gas tracking required by law enforcement units.
- Chrome-Lined Government Barrel: Features a premium 16.1-inch mil-spec steel barrel lined with hard industrial chrome to prevent bore erosion and handle intense rapid-fire heat strings.
- Centurion Arms M-LOK Handguard: Fitted with a rigid, free-floating slim aluminum handguard that keeps accessories tight while improving barrel cooling and accuracy paths.
- MPI Factory Certified BCG: Includes a genuine Colt bolt assembly that has undergone Magnetic Particle Inspection (MPI) testing to ensure zero structural flaws in the steel matrix.
- Universal Pin-In Conversion: Drops seamlessly onto any standard mil-spec AR-15 lower receiver group without requiring custom gunsmith adjustments or modifications.
- Holistic Workbench Setup Bundle: Ships completely assembled out of the box with the BCG, charging handle, and flash hider to streamline your upper swapping workflow.
Product Specifications
- Brand: Colt's Manufacturing Company® (West Hartford, Connecticut)
- Model Line: LE6920 Enhanced Patrol Rifle Professional Conversion System Kits
- MPN/SKU Code: LE6920-EPRII-PRO-CK (Also cataloged as LE6920EPRII-PRO-CK)
- UPC Code Profile: 098289035639
- Chamber Calibration Standard: 5.56x45mm NATO Duty Clearance (Fully Back-Compatible with .223 Remington)
- Barrel Physical Length: 16.1 Inches (~408.9 mm Duty Grade Linear Rifle Profiling)
- Bore Interior Lining: Hard Industrial Chrome-Lined Core Bore and Chamber Paths
- Barrel Twist Core Rate: 1:7" Right-Hand Button Rifling (Optimized for Heavy 62gr to 77gr Projectiles)
- Gas System Interface Track: Direct Impingement Operating Setup (Mid-Length Gas Configuration Alignment)
- Handguard Attachment Layout: Centurion Arms® Slim Profile Free-Float Handguard with M-LOK Seven-Plane Tracks
- Upper Receiver Base Material: Heavy-Duty 7075-T6 Structural Grade Forged Aluminum Housing Block
- Exterior Finish Dressing: Type III Hardcoat Anodized Non-Reflective Matte Black Thermal Armor Shield
- Bolt Carrier Assembly: Full-Auto Profile Steel Bolt Carrier, MPI Tested Carpenter 158 Bolt Head
- Muzzle Device Thread Pitch: Standard 1/2x28 TPI (Threads Per Inch) with Mounted A2 Birdcage Flash Hider
- Full Kit Component Checklist: Completed Upper Assembly, M-LOK Rail, Complete BCG, Charging Handle Kit
- Packaging Format Class: Factory Original Sealed Colt Branded Armorer Shipping Presentation Cardboard Box
- Product Type Category: Rifle Components / Complete Upper Receiver Groups & Conversion Kits
- Net Component Module Mass: ~4.60 Pounds (~2.08 Kilograms Balanced Duty Upper Receiver Mass Profile)
- Country of Quality Manufacture: Developed, Machined, Assembled, and Performance Certified in the USA
- Warranty Tracking Protection: Fully Backed by Colt Factory Legendary Operational Product Lifetime Cover
