Original WW2 German Army Rifle Rubber Muzzle Dust Cap - MP40 - Smooth Type

There are two variations for the MP40, one with a ribbed side and another with smooth side. Both do the same job however.

For use. After buying these we often get people calling up asking why they don't fit. This is because they originally needed to be put into boiling water to expand them slightly so they would fit over the barrel.