I have a 10/22 like I've never seen before. Marked 50th anniversary but has hardwood Monte Carlos stock, 20" blued barrel that hasn't been tapped for sights. Stock has Ruger butt plate, and receiver marked 50 years 1964-2014. Every thing I've seen says it should have stainless barrel, with compensator and peep sights with a black composite stock. Any one know why the big difference?