nice job on the finish, and good shooting with open sites. I never had any problems with the open sites on both my 57s but it was a struggle with my ageing eyesight. What shape are those pellets your using, pointed,flathead or domed.
Got mine last week took it to the range. Shot left and sight would not move far enough to compensate. Couple good wacks with my ballpien hammer and all is good. I'm going to paint sights white so I can see them.Duck