A while back I decided I had to have a 999 Sportsman. Top break , slab sided barrel , I was smitten. I found one , kept it for a couple of years and shot it quite a bit. Eventually I became disillusioned , and here's why: The mechanics of the cylinder - particularly the disassembly release and the spindle upon which the cylinder turned , seemed lightly built , almost flimsy ; the single action trigger was so-so , double action , well , awful. Just did not feel like a good solid firearm. (The older H&R .22 Special actually seems the be of tighter tolerances.)
I miss having a .22 top break. If I ever replace the 999 it will be with an Iver Johnson Sealed 8 , which looks and feels like a better built hand gun , IMO.
Sorry to rain on the parade.