The M4 is the first Benelli semiautomatic shotgun to feature Benelli’s extraordinary, innovative and patented gas operating system. It is fitted with a blade type front sight protected by side lugs and an adjustable dioptre. The barrel is internally chrome-plated and externally phosphated. The M4 stands is one of the best shotguns available today in terms of performance, choice of materials and reliability, as guaranteed by all Benelli products. This model comes with a convenient pistol grip stock for immediate and ready action.