Hi, I recently bought a CZ 452 Lux .22 l.r. rifle and have been thinking of getting a .22 l.r. pistol for the range. I read many threads in the forum and found most recommended .22 are: Browning Buckmark, Ruger Mark III, Ruger 22/45 and S&W 617 revolver. The S&W 617 costs over $700, which is a bit much for .22 l.r. Anyhow, I'm interested in getting either a Ruger Mark III or 22/45. There're many different models within each line of product. What's the difference between the Mark III and 22/45? Which model from each line would you recommend and why? Also, what's an Fiber Optic front sight? Some target and hunting models have it. Is it as sturdy as the traditional iron sight? I like the stainless finish with wood grips. There're "exclusive distributors" model from each line. Not sure if I have to buy from them directly or I can buy thru my local gun shop. Any other recommendations are welcome. Thanks.