Colt M4 FPB 5.56 16.1" 30-Round Rifle

The Colt M4 FPB is a semi-automatic AR-15 rifle built on a 7075-T6 aluminum upper and lower receiver with a Type III hardcoat anodized black finish. It is chambered for 223 Remington and 5.56x45mm NATO and uses a direct gas impingement system.

The rifle has a 16.1-inch 4150 CMV chrome-lined barrel with a 1:7 right-hand twist and 6 grooves. It features a Geissele MK4 13-inch free-float M-LOK rail, a single-stage trigger, and a reversible safety selector. It weighs 7.3 pounds and accepts 30-round magazines.

Magpul MBUS Pro front and rear backup sights are included, and the Magpul CTR 4-position adjustable stock collapses to 32.5 inches and extends to 36 inches. It has a standard A2 pistol grip.

• Action: Semi-Auto
• Calibers: 223 Remington, 5.56x45mm NATO
• Barrel Length: 16.1 inches
• Barrel: 4150 CMV chrome-lined, 1:7 right-hand twist
• Finish: Type III Hardcoat Anodized, black
• Material: 7075-T6 Aluminum
• Weight: 7.3 lbs
• Capacity: 30 rounds