The HGUC Mass Production Gelgoog can be transformed into this Gelgoog Cannon by swapping its head and backpack, but it doesn't appear in the anime "Mobile Suit Gundam," so honestly, it's like, "Who are you?"

But it looks cool, so that's okay 🤓
I'll turn the Mass Production version into a digital diorama of the package someday, but for now, I'm deploying the Gelgoog Cannon.
The torso had its seam lines removed and was painted with MS Deep Green.
The weapons and black parts are painted in gunmetal, and the rest is the molded color.

High-payout Gelgoog | ゆめわか's Gunpla works