For some reason my FLGR mates with the frame. I just peered into the ejection port and it looks like the FLGR is flush and supported by the frame. I also just put together my gun with just the slide stop holding the barrel in place. When I slide in the FLGR to see the fitting, the FLGR never comes into contact with the barrel's lower lug, even when I move the barrel around. Are STI's made different or is the GI guide rod supposed to act differently? My STI has a ramped barrel, perhaps that is why it is acting different? It doesn't seem like the guide rod is ever supposed to contact the lower lug.