Here's some pics of my still in progress Endor rifle. I've been doing a lot of fiddly crap and filling/sanding (which I HATE!).
The barrel is all together, minus the front part with the site, which I left off in the pic. The "spot welds" are done with JB Weld to hide the bolts running through the tubes and replicate the original.
I used Lab Metal to fill about 1/8" on the ends of the tubes. So it will look and feel like metal. If you're not familiar with Lab Metal, it's a putty with metal in it. It looks like dark gray until you sand it and then it looks like metal.
I still have no idea of the exact M16/AR15 they used for the lower receiver so I got the closest one I could find. That meant having to add the extra detail (which is the bare metal, made with Lab Metal too) and mag fence. I still have to shape the left side where the small piece transitions into the big piece. Right now it's just sitting there so if it looks crooked, it isn't attached. It may not be perfect, but I'm calling it close enough because I'm getting tired of working on this! :lol