I stopped in at my LGS and noticed he had a SU16A so I asked what his best price out the door was he quoted me 570.00. I would like to know if this is a good price and if there is any way to determine when this rifle was built it looks like it has been on the shelf for awhile, I am not that familiar with Kel-Tek and am not sure if they have made any improvements over the years. Any help would be greatly appreciated.