Here's the Bad Juju exotic pulse rifle from Destiny. This weapon is set up to be 1:1 to the in-game model, approximately 33" long. I have added a working charge handle, trigger mechanism, and a removable magazine that slides into place. There are quite a few parts to this, even more now that it has been cut to fit the 7 inch bounding box supported here, but the parts are designed to build in component sections and then assembled (hopefully) without too much trouble. Because of the design, some parts do require supports, but I tried to keep the total amount down.
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There is an attached explosion picture of the major parts numbered, they can be identified in the file .zip as follows:
(some parts have been cut down smaller than in the image to allow printing)
The main component parts that you need to be careful with for assembly order are the main body and the receiver halves.... You have to install the bolt components and a spring in the left receiver half before joining the two sides, and the same goes for the trigger before joining the main body halves. There is an attached image with the trigger and charging handle components color-coded to better understand operation and assembly.
the trigger drops into the trigger cutouts (the cutouts are in each side of the main body so the trigger sits in the middle) You can clean up both the cutout and the trigger and then test-fit it in with the main body halves just held together to make sure it slides OK (tolerances are like .5mm, so cleanup will obviously matter). Once it's good, you'll need a small compression spring or two to put in behind the trigger if you want it to move/return. I would just find a couple as big a diameter as will fit in behind the trigger, and then glue one in high and one low to the main body. Test it, adjust if needed, then glue the halves together and go from there. Now for the Receiver and bolt assembly, this is all only on the left side of the receiver (there's no bolt handle or cuts on the right). After you clean up the cavity and the bolt parts, you can test it out. the two parts in green are the slide and the bolt handle itself, while the blue is just the cover that goes over it all and retains the parts. You'll see right away when you get into it that the slide has to be put in place and then the bolt handle installed in the hole in the slide from the other side (the whole handle won't slip through the hole in the receiver). Soooooo, once you get the slide moving back and forth clean, you can then find a spring to run between the slide and the little mount in the front end of the receiver cutout. It'll be apparent then, but you want a spring that will pull the slide forward easily when you let go of it, but not so much that it slams the heck out of it every time and risks damage. I would even glue a piece of EVA foam or something at the 'bolt closed' end of the movement to kind of cushion the movement. The last piece (blue in the render) of course just holds it all in, so you can get it working nice before you glue the receiver halves together.
After the trigger and charger pieces are installed, hopefully everything is pretty easy to follow... The shrouds can be installed last, along with the butt assembly and it's two small side adjusters. I also added several alignment tabs/slots to help you out, namely with the shrouds so they locate properly. Lastly is the laser sight (part 2) that goes on the barrel. if you print it in one piece, you'll have to CAREFULLY sand the inside of it's loop down so that you can slide it onto the end of the barrel and glue it into place. It is thin, so, it may take a bit of finesse to clean it up.
Lastly, I did include both the skeletal pieces pictured and the rings that connect the gun's strapping; the skull and bones may require some grinding along their bottoms, depending on how close and tight you want them to fit on the weapon. Nothing a dremel can't handle though. :) For the straps, you are on your own.