Modelled entirely in fusion 360 and coming in at 40cm long this Destiny 2 Better Devils/True Prophecy replica has a working swing arm and magnetic locking power cell chamber.
There is also the option of the clean flat option for the lower barrel piece, or the version with the same hex pattern as the grip (still printing as of this writing). The in-game model has the hex bump map, but some might prefer a cleaner option for post-finishing.
The trigger is pinned with a 18 gauge brad nail that is clipped. I've been experimenting with ninjaflex springs for the trigger, but it's not quite there. Substitute your own spring or just glue the trigger into place if you don't want to bother with pinning the trigger.
the power cell when the chamber closes is locked into place with 2 3/8 neodymium magnets for a solid "snap" when closing.
Swing Arm Hinge
The hinge is screwed in place with a small 1/8" screw, the chamber is also affixed to the hinge with a similar screw, be sure to drill out the hinge as the hole is only about 5mm deep, not drilling a pilot hole could damage the hinge as the walls are quite thin where the chamber attaches.
Assembly vid is here - https://www.youtube.com/watch?v=vBKsaNe-e1g
Updated Dec 20, 2017 - Added a wall mount to the STLs, custom made to fit the contour of the front section of the prop.