It looks like a combat shotgun that is operated and textured as if it were a caravan shotgun. What happened is that one mod (pseudo reproduce the pre-release bonus packs) that I had used a long time ago, then discarded, had the mesh file for a combat shotgun still in the correct location. Apparently, FO loads from the .bsa files first, then looks in the folders in Data and uses those as the final items before going into the game or GECK. I've deleted the meshes and everything appears as it should, now. Huzzah!