Amazing that this thread now has 19 posts. This was a simple question, and should have had 1 maybe 2 replies, which should have answered the question. All you have to do is go to the ATF website.
Regarding definitions, if the gun is altered IE sporterized, it is not A C&R as others have said. Also antiques that are converted to fire modern ammo are not antiques although the older Remington 1858 conversion for example qualify since those modifications were done before 1898 anyways.
Winchester 73, the TFL user that won the west