This is the pistol grip for the Retro-Raygun. It contains the Atomic Energy Cell behind a spring-loaded catch (not included in this file).
Printed in WSF and assembled. I printed the Atomic Energy Cell separately on a Type A machine with suspect tolerance, thus I can't say for certain if clearance needs to be adjusted on the mesh. I also re-designed the interior spaces slightly to hold a matching socket for the Lithium Polymer "JST" connector, and a spring to aid in extraction of the energy cell.
The primary changes I would make now would be to add alignment ridges (same as are on the body) and chamfer the mating edges to emphasize the seam (being as part of the look of the raygun is visible assembly seams and hardware).