I just picked up a 3rd gen G27 a few days ago, pretty excited because it was either never shot or nearly unshot (no scratches on the sides of the barrel, everything perfectly clean, etc), plus it came with a bunch of extras, for a very reasonable price. One of the extras was an adjustable rear sight. It looks like the glock brand one. I took the gun out and tested it today, and everything worked fine but it was shooting low and to the left considerably. I shoot my G19 a lot (USPSA) and this don't have much of a problem hitting targets, so I took a closer looked at the adjustable site. I noticed that the sight itself wasn't centered on the slide. I was able to slide it back to center with my hand. I am sure shooting low can be corrected with the "adjustment", but the loose rear sight is an issue for me. I would like to use this as a carry gun, and think that I would run into an issue of the sights getting pushed to the side when carried. Is there something I can/should do to fix this, or do I just go order a set of night sights? I would prefer to keep these on it for a while, I have other things higher on the list than new sights.