Colt Firearms M4 FPB 5.56 16.1 Barrel 30-Rounds

Overview

Colt M4 FPB Features The M4 FPB is engineered with a 16.1 4150 CMV chrome-lined barrel featuring a 1:7 right-hand twist rate with 6 grooves providing optimal bullet stabilization for heavier 5.56 NATO loads across a wide range of shooting scenarios. The direct gas impingement system offers smooth proven cycling and the Geissele MK4 13 free-float M-LOK rail provides exceptional rigidity alongside ample space for lights lasers vertical grips and other AR-15 accessories. Upper and lower receivers are constructed from 7075-T6 aluminum with a Type III hardcoat anodized finish ensuring maximum strength with reduced weight at 7.3 lbs unloaded. For sport shooters and law enforcement who demand a military-specification rifle with premium aftermarket upgrades already installed the M4 FPB delivers a complete ready to run platform. The rifle includes Magpul MBUS PRO front and rear backup sights for reliable iron sight capability out of the box without additional purchases. A single-stage trigger and reversible safety selector round out the control package for consistent dependable operation. The Magpul CTR 4-position adjustable stock provides comfortable handling at a collapsed length of 32.5 inches extending to 36 inches while the standard A2 government pistol grip delivers a classic and familiar feel. For shooters who want a fully equipped mil-spec AR-15 with premium components installed from the factory the M4 FPB arrives configured and ready. The Colt M4 FPB reflects Colt s legacy of building military-grade firearms enhanced with purpose-selected aftermarket components for superior real-world performance. Its combination of a chrome-lined barrel Geissele free-float rail and Magpul furniture makes it a standout value for those who want a premium AR-15 without building one from scratch. For shooters who need a dependable modular and battle-proven rifle platform the M4 FPB delivers the performance Colt is known for and it is available for sale at GrabAGun. Colt M4 FPB Specifications Manufacturer: Colt Firearms Model: M4 FPB Type: Semi-automatic Rifle Action: Direct Gas Impingement Caliber: 5.56x45mm NATO Material: 7075-T6 Aluminum Barrel Material: 4150 CMV Barrel Length: 16.1 Barrel Finish: Chrome-Lined Twist Rate: 1:7 RH 6 Groove Muzzle: 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 Overall Length: 32.5 Collapsed to 36 Extended Weight: 7.3 lbs Capacity: 30+1 Includes: 30-Round Magazine Available At: GrabAGun