So I bought a extra siege Megatron a while back to swap heads with my Earthrise Megatron because of Earthrise's hideous Herman Munster head, but the Earthrise weapons have always bothered me. The arm sword is lazy and lacks any real fun way to wield it other than on his arm. I tried a couple weapon mods shared by other modders here on the site but none of them were quite what I was looking for, or I had trouble getting them made. So then I was thinking, why not just stick the Siege turret on the Earthrise toy? Turns out all that really involved was swapping out the back of the upper arms. Unfortunately I couldn't use the Earthrise arm canon because it's got a little nub on the front that stops the Siege turret/sword from going all the way in. All in all, I'm happy with the result.