Have you had any experience with the blank slide for a Gen 3 G17 to be specific? I'm interesting in hearing your thoughts about how the tolerances are with the slide to frame, barrel to slide and the firing pin assembly to the slide. Obviously, if they're loose, it's much harder to correct, too tight then they can be refined. I've heard some questionable comments but the people that spoke don't actually own one, hence the validity of their experience with it. I'd appreciate honest opinions or even suggestions to a source of blank slides.