Never say never, but to my knowledge a rifle was not normally fitted to a motorcycle (other than a Big 4 outfit). A motorcyclist might wear a pistol holster and we have seen a couple of pictures of riders carrying a Sten gun by it's sling.
Better buy a Harley! You can carry a Tommy gun, baseball bat and glove, and a wailing sireen.
There is an original picture of an M20 with a rifle carried on the side, but it predates pannier bags so that may be why it was discontinued, we discussed it in a previous thread, this could be it but I will have to reload the pictures.
