[rpj541]

I'm having trouble getting my P11 back together after cleaning and hope someone can give me a little guidance. Each time I attempt to replace the slide, the guide rod moves forward and then won't let the slide go back in place properly. I'm sure it's something that I'm doing or not doing, but I just can't figure it out. Can I get a little help please? Thanks, :?
Ray

 

[Flyer]

From what you're saying, it sounds like you're not putting the guide rod all the way down at the rear into the barrel groove. This would lead to it hitting the frame and moving forwards when you put the slide on.
Be sure to put the guide rod all the way down above the chamber. You'll need to compress it a little, then slide it all the way into it's notch.
My guess is that this is what you're experiencing.
Flyer