Of all the weapons in the vast Harrison Armory, nothing was more profitable than the Sherman MK1
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So somebody took a Nick Cage bit about an AK-47 and changed out some words for a "mech" named after a WWII tank. Not only does it sound like garbled nonsense from someone who lacks a single creative bone in their body but it makes me pity anybody subjected to such a half-assed slapdash of a setting.