Colt M4 Monolithic Carbine 5.56 NATO, 16.1 in

About this product

The Colt M4 Monolithic Carbine is a semi-automatic modern sporting rifle built around a one-piece monolithic upper receiver and a continuous Mil-Spec Picatinny rail for repeatable optics mounting. Chambered for 5.56 NATO / .223 Remington and fitted with a 16.1 inch government-profile barrel, the platform is configured for modularity with a removable lower rail and Picatinny quad-rail sections. Controls and ergonomics follow familiar M4-pattern conventions, including a 4-position collapsible stock and Magpul MBUS flip-up sights for immediate sighting options.

Key Specifications

• The caliber is 5.56 NATO / .223 Remington.
• The barrel measures 16.1 inches and is described as a government profile.
• The action is a Semi-Automatic AR-pattern system.
• The rifling twist rate is 1:7.
• The upper is a one-piece monolithic receiver with a full-length Picatinny rail for optics repeatability.
• The sights are Magpul MBUS flip-up front and rear backup sights.
• The stock is a M4-style collapsible (4-position) stock for adjustable length of pull.
• The muzzle device is an A2-style flash hider.
• Includes one 30-round removable magazine.
• The handguard/rails are Picatinny/quad-rail for accessory mounting.

Built for durability, modularity, and consistent optics alignment, the Colt M4 Monolithic Carbine suits range work, competitive and recreational shooting, and defensive-minded owners who prefer a familiar AR platform with an integrated rail system. The combination of the monolithic upper, flip-up MBUS sights, and an adjustable stock provides a versatile base for mounting optics or running a factory-ready iron-sight setup. With standard AR-pattern ergonomics and readily available accessories, this carbine is intended for shooters who want a dependable, configurable modern sporting rifle.

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