Sorry so long getting back and thanks for all the replies. I haven't opened the gun up yet but will this weekend. The gritty part is the trigger return, however, the SA is very hard to pull. I will weigh it before I do anything. The strain screw is night and tight. I feel very sure that this gun was not messed with- it showed no signs of previous firing. Got the JM video and I'm going to start grinding on the stone- just kidding. I'm going to take this extremely slow and practice on old junk first. If, and it is a big if, I decide to go to a different spring, what would you all recommend?
Thanks again for your help.
Dewy