I own a PT845. I've run about 1000 round through it, and I carry it now and then. Mine looks just like that and it functions perfectly. I don't see anything wrong or out of place with the way the frame and slide fit together. I would say that what you've described is normal. I have not tried squeezing the frame and rail together, but I suspect I would get the same result as you. Mine as never had a FTF or FTE. It's accurate and smooth.