Add a small drop of gun grease on the top left and right edge and spread it with your finger before you put the slide back on. Then rack it a bunch. That may help the noise, but not sure.
I think he might be talking about the slide noise issue in the post below????? this one http://hipointfirearmsforums.com/Forum/viewtopic.php?t=4065
Wow, I have no idea how I did that without even noticing! Yes, I was actually meaning to reply to the linked thread above...oops