Didn't read through all the posts so if this has been said, I aplogize.

As you cannot manufacture any new full auto firearm for civilian use you'd need to purchase a 10/22 reciever already registered as such. I do believe there were some full auto trigger assemblies around a few years ago that were commanding upwards up $10K.

I did see it mentioned and I gotta ask again myself...you're concerned about the extra $40 for a new 10/22 compared to the marlin adn now you're thinking going Clas III. AT a minimum you've got the $200 tax stamp and that's without any firearm yet. Minimum you'd have $1500 in a cheap crappy POS Uzi-likething. of course being 16 eliminates the whole probability anyways.