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The M4 carbine is a 5.56×45mm NATO, air-cooled, gas-operated, magazine-fed, carbine, assault rifle developed in the United States during the 1980s. It is a shortened version of the M16A2 assault rifle.
The M4 is extensively used by the United States Armed Forces and is largely replacing the M16 rifle in United States Army and United States Marine Corps (USMC) combat units as the primary infantry weapon and service rifle. The M4 has been adopted by over 60 countries worldwide, and has been described as "one of the defining firearms of the 21st century".Since its adoption in 1994, the M4 has undergone over 90 modifications to improve the weapon's ergonomics and modularity, including: the M4A1, which strengthened the barrel and removed the burst-fire option; the SOPMOD, an accessory kit containing optical attachments; and, the underbarrel M203 grenade launcher.

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  1. Sherwood1911

    A companion for my M4 Carbine Build

    I recently bought an M4 Carbine Kit from PSA minus the lower receiver. Frankly my first anything with a rifle. I bought the lower receiver at NW Armory. Essentially to learn rifle basics, and purchase at NW Armory (instead of online retailers) to avoid the FFL charges which lately are running...
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