looking at your tank again barry I noticed that it has an enlarged top gun mount? what did you use to make the new cannon?
Honestly, Devin, I don't have the foggiest idea. After 15 years of heavy collecting, I've amassed a boatload of fodder, and I just picked through some boxes and went with something that would fit.
I put a gun near the upper hatch, which swivels 360 degrees, plus the main barrel swapout and the forward gun, all of which, I'm not positive of the origin.
Sorry about my crappy memory, and thanks for your interest.