I'm guessing the Denver law will still be in place which would still ban anything over 20 regardless of when you bought them. Also, the law was changed a couple years ago, from what I can tell in Denver it is legal to have the rifle, it is legal to have the mags but the law is violated when the magazine is inserted into the rifle. At least that is how it reads to me on the RMGO web site and a couple other articles I have read.