Finding parts isn't that big a deal for model 17s, at least since the internet came along. Two or three being parted out there in cyberspace daily, it seems.

I have a gun that drops it's slide from the verticle position-a first year model 12. I'm pretty sure this fact is of no relevance to anything, least of all, shooting the gun with any proficiency. Retarded children, perhaps, might be amused by this display, at least for a while.

You want to impress me, show me a pump that ejects the spent empty, cocks the gun and cycles a fresh round when the slide lock is released while the gun is held verticle.

That would impress the hell out of me.
Best,
Ted