I have owned my G23 for a while now, and I had to replace it's stock plastic sights for steel sights, because the plastic sights came loose. I just bought a G26 and spent the extra money for night sights. I thought that the night sights would come screwed in the slide, like after market sights. But they don't in fact they look like they might come loose just like the plastic sights. My question is will they come loose? thanks in advance for the replies.