no one puts them on the tables anymore. i know a couple dealers knew of people who would probably sell them if people wanted to buy them. thing is, the asking prices are insane these days!
there's one collector in MN that has at least a dozen 01's, thats like what he collects/collected. i know a dealer in MI, who had a lot at one time, but i think he has been steadily selling them as MI is C&R as well.
you usually have to seek the 01s out these days, you won't find too many in dealer inventories.
if you got an 01, you would strip EVERY part off the receiver and then put a M16 parts kit onto the 01 receiver. you don't want to shoot original 01 parts these days. the 01s run fast and parts can break easily, plus they are SPENDY and RARE to find.
once you get an aftermarket M16 parts kit on it, you can beat the hell out of the gun and not hurt it.
Craig