This is my AIE-486H Heavy Machine Gun from Halo 3! It stands 3.5ft long and the barrels spin. Pepakura files were used for the external bits and there are 3d printed bearings on the inside powered by an electric drill. If you have any questions feel free to ask!
Cheers man, I'm probably going to redo that piece with thinner foam, this was just too thick and didn't quite give me the amount of detail/shape I was going for
A WiP shot of it, forgot to add that because I made the main body, handles, and barrels PVC this ways about 7-8lbs... a bit heavy for a walk around prop.