i was assuming the op has a gen3, as he didn't specify. however, the gen4 frames are not compatible with gen 3 uppers. the dust covers are different to match the different slides.I'm assuming it doesn't matter to the OP what generation or type of receiver it is at long as it fits whatever type of G17 slide he/she has. degelpe-- if you actually find out if you can get a gen4 frame without having to buy a whole new gun, let me know-- I'm trying to find a new home for my trigger reset kit so that I don't have to keep swapping it out with my stock trigger assembly.
Welcome to the forums, by the way.