Thank you. That was much more helpful. I'm not trying to be an A$$, just trying to learn. Guess what I should have done was look up as much about the stats and mechanics about each rifle, but there didn't seem to be too much out there about the RAV. One of the only reasons I was interested in the RAV was that it was inexpensive and it seems to use Glock magazines.
You are correct, I should have been more specific with my question.
What I was really trying to get at was what are the mechanical differences between the two. I know that the AT9 is not permitted. Are there really that many mechanical differences between them or has the government, in it's infinite wisdom, just decided that the AT9 and any derivatives were banned as you said.
As I said, I know very little about these types of rifles but I am very interested in learning. Mechanically I assume they are basically the same but I'm sure there are differences such as barrel length or overall length that will actually make a difference and there are some things that are purely cosmetic.