This is a semi-scale mock up of the aviation version of the Browning AN/M2 .50 caliber machine gun used in WWII Bomber aircraft. Included is the cradle and a mount/pivot plate that held the gun at the back side of the barrel. The model is far from perfect but for the scale I'm building this model at (1:9th) it looks pretty good. Prototypes have just been printed and hit with paint for contrast. Final parts will be printed, primed, painted, weathered, and combined with an ammo belt to complete the look.
Video of the CAD progress for this build can be found at https://www.youtube.com/watch?v=EJLHaAGbwT8
The full build thread for the 1:9th scale model can be found at https://www.rcgroups.com/forums/showthread.php?3149360-1-9-Scale-B-17G-Sweet-Pea
Play with infill settings to get desired strength. Final version will likely incorporate a hollow barrel to accept a support wire due to the thin, breakable nature of the barrel when printed.