Colt M4 FPB Features
Engineered with a 16.1-inch 4150 CMV chrome-lined barrel and a 1:7 twist rate, the Colt M4 FPB provides optimal bullet stabilization for heavier 5.56 NATO loads, enhancing accuracy and reliability across a wide range of shooting scenarios. The direct gas impingement system offers smooth, proven cycling, while the Geissele MK4 13-inch free-float rail allows for exceptional rigidity and space for AR-15 accessories like lights, lasers, and vertical grips.
The upper and lower receivers are constructed from 7075-T6 aluminum with a Type III hardcoat anodized finish, ensuring maximum strength with reduced weight. For enhanced usability and control, the M4 FPB includes Magpul MBUS PRO backup sights, a single-stage trigger, and a reversible safety selector. The rifle’s Magpul CTR stock provides AR-15 Adjustable comfort in a 4-position collapsible design, while the A2 pistol grip offers a classic and familiar feel. With a 30-round magazine included, this rifle is mission-ready straight out of the box.
Colt M4 FPB Specifications
- Manufacturer: Colt Firearms
- Model: M4 FPB
- Caliber: 5.56x45mm NATO
- Type: Semi-Auto Rifle
- Action: Direct Gas Impingement
- Capacity: 30 + 1
- Barrel Length: 16.1″
- Barrel Material: 4150 CMV
- Barrel Finish: Chrome-Lined
- Twist Rate: 1:7 RH, 6 Groove
- Muzzle Device: A2 Birdcage Flash Hider
- Upper Receiver: 7075-T6 Aluminum, Type III Hardcoat Anodized
- Lower Receiver: 7075-T6 Aluminum, Type III Hardcoat Anodized
- Rail: Geissele MK4 13″ Free-Float M-LOK
- Grip: Standard A2 Government
- Stock: Magpul CTR 4-Position Adjustable
- Sights: Magpul MBUS PRO Front and Rear
- Trigger: Single-Stage
- Safety: Reversible Selector
- Operating System: Direct Impingement
- Overall Length: 32.5″ (Collapsed) – 36″ (Extended)
- Weight (Unloaded): 7.3 lbs
