While the OP is obviously using the term elegant as most people do, to wit "pleasingly graceful and stylish in appearance or manner", I've always had a hard time with that definition. It's just so subjective. Having a more technical and analytical view of the world I've always preferred the alternative definition, "pleasingly ingenious and simple".
Pump Shotgun: There is no such thing as a graceful pump shotgun! But some of the most memorable lines are on the Winchester 1897 with a 20" barrel.