I previously owned a G17 which I purchased new. On impulse, I traded it for a Beretta 92 Vertec, which I immediately regretted before I even received the Vertec. It isn't that the Vertec is a bad gun, I just liked the G17. Regardless, I just picked up a new G17, one of the Lipsey grey ones. I noticed this gun rattles when I shake it. i do not recall my prior one doing that. The rattle is more pronounced when shaking the gun parallel to the slide, less pronounced when shaking it side to side. It is worse when the slide has not been racked, Is this normal? Also, I just noticed this gun has a small crack at the bottom of the mag well. I bought it through Tombstone Tactical. Do I return it to them or to Glock?