>>8235653https://www.thingiverse.com/thing:4297316Here's the rifle all printed up. It's better than it thought honestly, only had to do some minor cleanup on the 5mm peg, but it fits in Prime's hand perfectly.
I'll print up Roller next and show him off when I finally do it. I'll need to do the wheels first because I actually have blue filament on hand to print his actual body with, I'm just lazy and we'll see how long it takes for me to actually swap out my current spool. But judging from the quality of the rifle, it should turn out nice.