The Colt M4 Carbine FBP Configuration in 5.56x45mm (MPN LE6920FBP2) builds on the venerable Colt LE6920, adding a Geissele 13-inch MK4 free-float rail system and Magpul Pro flip-up front and rear sights for this special-configuration model. Colt builds the 16.1-inch barrel from 4150 CMV chrome-lined steel with a 1:7-inch, 6-groove right-hand twist, mounted to 7075-T6 aluminum upper and lower receivers with a black hardcoat anodized finish. The rifle carries a reversible safety selector, a single-stage trigger, a Government A2 grip, and a Magpul CTR 4-position stock, running a direct gas impingement system. It ships with a 30-round Magpul PMAG, a manual, and a cable lock. Among AR-platform rifles in the AR rifles category, the M4 Carbine FBP favors shooters who want a genuine Colt LE6920 upgraded with a Geissele rail and premium sights.

Key Specifications

• Chambered in 5.56x45mm/.223 Rem with a 1:7-inch rate of twist.
• Features a 16.1-inch 4150 CMV chrome-lined barrel.
• The rail is a Geissele 13-inch MK4 free-float design.
• Ships with Magpul Pro flip-up front and rear sights.
• Receivers are 7075-T6 aluminum, black hardcoat anodized.
• The safety is a reversible selector.
• The trigger is single-stage.
• Fitted with a Magpul CTR 4-position stock and Government A2 grip.
• Feeds from a detachable magazine with a 30+1 capacity, one Magpul PMAG included.
• Weighs approximately 7.3 pounds unloaded.

Frequently Asked Questions

What makes the FBP configuration different from a standard LE6920? It adds a Geissele 13-inch MK4 free-float rail and Magpul Pro flip-up sights.

What accessories are included? A 30-round Magpul PMAG, a manual, and a cable lock.

Is the safety selector reversible? Yes, for left- or right-handed use.

Buy the Colt M4 Carbine FBP Configuration

A genuine Colt LE6920 upgraded with a Geissele rail and premium sights is exactly what the M4 Carbine FBP delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.