An attempt was made to improve it in the Model C by reducing the weight of the explosive and increasing the thickness of concrete while still retaining the metal explosive container. The metal explosive container, however, has been dispensed with, and the concrete has been precast on a gridded steel rod framework. The steel framework is welded to a cast steel plug at the nose and a cast steel ring at the tail. The tails are of sheet steel. Early models had the tail set in concrete.
Later models have a detachable tail.
Vertical or horizontal suspension is used. Bright green overall.