Would love to know! they are sweet looking guns! Would make a nice addition to my collection. Ton of history/

Yes, legal, check out tommy gunner for lots of info, they will custom make 15 round magazines so you dont end up with those silly looking 5 round factory mags, also the guns are heavy and not everyone has good experience with aluminum recievers. They are cool and maybe I will be buying one myself soon.

yeah I saw one in a shop that even had a 10 round drum magazine. That had to be the worst weight to capacity ratio of any magazine I have ever seen. 

I was actually considering purchasing the "Squad Leader" type for myself as a present when I retired from the military.  100% legal and looks like a barrel of fun.