The M249 is a light machine gun with a robust, elongated barrel and a rectangular-shaped receiver, featuring a bipod attached near the muzzle for stability during sustained fire. Its body is primarily constructed from matte black metal with textured polymer grips and stock, providing a non-slip surface. Distinctive design elements include a top-mounted carrying handle, a perforated heat shield over the barrel, and a large box magazine or belt-fed ammunition system, emphasizing its role as a high-capacity support weapon.