I fixed my G19 this morning, turned out I installed the slide removal latch (the one you pull down to remove the slide) the wrong way. I don't know if yours has ever been removed, but on one side of it there's a beveled edge, the other side is square. Beveled edge has to face forwards (allows the cam on the outer barrel to pass over it, push it down to lock) and the square edge has to face back. Easiest way to tell the difference if you can't see, there is a indented circle on the beveled edge side in the center, and on the square edged side there are two rectangular indents.
Doubt this is your problem, but at least I sorted mine out and am putting the fix down here for the record.
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