I have been looking at the Anschutz website and I cannot figure out what the model numbers mean. What are the features, the differences, sights or no sights? Is the "54" the action and the "1700" the rifle made from that action? Please help me out. Specifically, I would like a .22LR sporter weight w/o sights, something like the 77/22 or Rem 504. Also, how much should it cost? I am only a casual shooter.