I got a colt 1903 about a year ago off gun broker and it was jammed up pretty bad, but I was able to fully disassemble. I went ahead and stripped and reblued everything and it actually looks pretty good. Have put a few hundred rounds through it and not one problem.
The problem I am having is that the grip safety doesn't work. (the gun will fire without pressing it in)
And when I pull the slide back theres a catch. ( it's not smooth like other 1903s I've handled.
I'm pretty sure the problems are related.
I've had it completely apart 5 times. Replaced all the springs and the leaf spring thing and still is not operating correctly