Huh, you are right, they do specifically call out Vise blocks, though they also specify AR-15/M16 vise blocks. I wonder if it's possible to just add an AK trunnion pattern to it and still list it, since it's no longer AR-15/M16 specific...

It looks like they allow "vise blocks not intended for use with assault weapons"

So a top level reading would indicate they don't allow ak47 vise blocks either.

They do not define the term "assault weapon". It only has a legal definition in a handful of states.

True, and even when there was a federal AWB the definition was kind of arbitrary.

pistol grip + collapsing stock? assault weapon!

pistol grip + a2 fixed stock? not an assault weapon?

While may be controversial but are legal tools to purchase and own. Regardless of a company specific policy.