Ripped from DestinySTLgenerator and then made printable.
The files gained this way are quite low quality and low detail so I had to model a couple of things back in myself. The "knobs" and "bolt shroud" are made as extra, print out the number you need.
I used appropriately sized hex bolts from eBay to fill the shrouds, I cut the head off the threads and just glued them on where needed. (you might have to drill out where the bolts go to make them sit flat).
You'll also want to source a short leather strap, again I got this from eBay. Scale your "Buckle" depending on what leather you bought.
The site glass was a small disc of acrylic that I got from......yup, you guessed it, eBay!
Other details you might see are painted o-rings.
Hopefully you can work it all out from the Meshmixer screen shots, I tried my best to give an exploded view that people would be able to follow.
I even included the stand I used. Original found here: "thing:1511233" the one included with mine is just scaled 135%.
Any questions just ask, hopefully I can answer.
The only known problem I had was between the "Butt" and "Body 1.2", in my print I had to cut it down, I edited the files so they should work, let me know if they don't.
Mounting the sight on the rail and then on to the body is a little tricky, dry run it a few times before trying to glue it.