That is one of our early guns. The cracking of the slide has no bearing on the frame rails whatsoever. Those should be fine. The slide was made from 17-4PH SS and the barrels were made of 416SS. The dissimilar metals did not wear well together and some of the slides cracked. That issue was taken care of immediately and then we switched over to 416 for both the slide and barrels. There were no issues after that change. The slide rails were also beefed up on the newer models. If someone wanted to grab this, I could send you a slide to use, just pay for the shipping. I believe I have a few laying around. You would possibly need to fit it to the frame, or it may very well just work without any problem at all. A gunsmith would be the best way to go to install it initially though I would think, as you will need to install the extractor and the firing pin.
