The British Centurion Mk 5/2 with its new 105mm L7 main gun introduced a ranging gun. This was derived from the M2 Browning design, both the L6 variant of the gun and also its 12.7×99mm ammunition. This ammunition was once again ballistically matched to the main gun. As this was a rather higher velocity round than the recoilless rifles, the case was the same as the M2 and the rounds could be used in either weapon. The enhanced tracer effect of the spotting round was sometimes used in an M2. Mounted in the Centurion it was alongside another conventional co-axial machine gun, the ranging gun being the one in the mantlet closest to the main gun.