screamingmetal
Super Freak
I still insist that the original was based on a TEC-9 with a barrel extension and folding stock, very popular at the time the first Firefly was made:Mat49:
I think you are right! This definitely seems to have been part of the inspiration behind Firefly's gun. It has the weird shape to the magazine, the closeness of the grip and magazine, the sharp angle of the grip, and the retractable stock.
But either would work.
I plan on ditching the green Steyr TMP and using the Ultimate Soldier Kimel AP-9 (TEC-9 knock off) on my Firefly. Not a perfect match but it's the only 1:6 weapon that comes close.