The M4/M4A1 5.56mm Carbine is a lightweight, gas operated, air cooled, magazine fed, selective rate, shoulder fired weapon with a collapsible stock. It is now the standard issue firearm for most ...

M4A1 rifles The M4A1 rifle, which uses 5.56x45 mm NATO ammunition, is often compared to its civilian version known as the AR-15. It is characterised mainly by a 14.5-inch barrel, although 16-inch ...