So this is a new 9major gun on a PT frame and a STI grip. I went with a MBX mag for my reload mag. After a few practice sessions\matches, I noticed the mag lip was dented. I took the gun apart and found what is in the pictures. After a little more investigation, the front high corner of any older STI, SVI, or new MBX mag makes contact with the bottom squared corner of the feed ramp. Due to the way the gen2 STI mags are cut, they are free and clear. I have confirmed that the marring on the underside of the feedramp does not affect feeding or function of the gun, at least from what I can tell.