I used 3-D printed parts and and some aluminum. I squeezed the tube in a vice. It is not quite the right elliptical shape, but I like the look and feel of real metal. The bit on the back was done on a lathe, Like all my Fett parts, it's a work in progress.
-I used the ball end of a couple pop rivets to create the look of an aluminum rod through the back and made a new aluminum trigger. Used a spring to make it operational.