Probotector

If that's the case, why is Maruzen allowed to sell their shotguns? Sure their system isn't as "real", but asthetic-wise they feel "legit".

Because the Tanakas were so real they took real steel internal parts and could chamber (but not readily fire) an actual 12 gauge.

Ouch, that's understandle then. Too bad there are no metal bodies for the Maruzen afaik but the shell ejecting mechanism makes up for that.