british army and u.s. army both employed 4.5 inch (114 mm) pieces with similar characteristics, and designed to utilize the same ammunition - bl 4.5 inch medium field gun and 4.5 inch gun m1 respectively. the 5.65-ton m1 fired a 24.9 kg shell to the maximum range of 19.3 km; however the only type of ammunition available for the gun was a he-frag shell, and that contained only about two kg of explosives.