The eFH18/40 gun is basically a stripped down version in an attempt to produce a lighter gun easier to handle by the crews and for ease of manufacture by incorporating the lower carriage and trail arms from the PaK40 along with a smaller modified shield, smaller wheels and a large muzzle brake to help reduce the recoil forces on the lighter carriage. This was not entirely successful as the 105mm gun recoil was too much for the lighter carriage and caused a number of problems but still over 10,000 /40s were produced.