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
Frequently Asked Questions About This Product
Why buy Colt Firearms M4 FPB 5.56 16.1" Barrel 30-Rounds from Miami Shooters Supply?
We’re a trusted firearms dealer offering fast shipping, competitive pricing, and 100% compliance with U.S. federal firearm laws. All orders ship from our licensed facility with full tracking and expert customer service.
Where can I buy Colt Firearms M4 FPB 5.56 16.1" Barrel 30-Rounds?
You can purchase this item directly on our website and have it shipped to your local FFL dealer. You can also visit us in-store in Miami, Florida.
Is Colt Firearms M4 FPB 5.56 16.1" Barrel 30-Rounds available now?
Availability is shown live on this page. If the “Add to Cart” button is visible, this item is currently in stock and ready to ship.
What category does this product belong to?
This product is listed under: Modern Sporting Rifles.
What tags or features does this product have?
Key features and tags for this product include: Modern Sporting Rifles.
Is this product legal in my state?
It is your responsibility to ensure this item is legal in your state or locality. We ship only to valid FFL dealers in compliance with U.S. laws. Always check your local regulations.
FFL Transfer & Firearms Laws for Colt Firearms M4 FPB 5.56 16.1" Barrel 30-Rounds
All firearms, including the Colt Firearms M4 FPB 5.56 16.1" Barrel 30-Rounds, must be shipped to a licensed Federal Firearms License (FFL) dealer. You will be required to complete a background check and any necessary paperwork before taking possession.
How It Works
- Place your order online.
- Provide your preferred FFL dealer information.
- We ship the firearm directly to your FFL.
- You complete the background check and pickup at the FFL.
Legal Compliance
We comply with all federal and state firearm laws. It is your responsibility to ensure the Colt Firearms M4 FPB 5.56 16.1" Barrel 30-Rounds is legal in your state. Some states may have restrictions on certain firearm models or features.
Helpful Resources
Need assistance? Contact our Miami store for help with FFL transfers and firearm compliance.
