Can't speak to the g17 gen 5 KKM, but I have lots of gen 3 threaded KKM barrels and really like them. I believe Barsto makes a threaded g17 gen 5 as well. Also, glock released a factory threaded barrel for the g45, so we might be seeing a g17 gen 5 factory threaded at some point. Haven't heard anything yet, but it might be a possibility in the future.