My MK9 has a slight wear mark that looks like it could be peening from contact between the frame and the barrel. I have about 680 rounds through it.

The area is visible with the slide off. It is on the left side of the inside frame about 1/8" to 1/4" in front of the opening for the slide release lever (not pin). It is on the other side of the slide release spring.

It appears to be caused by the barrel near the top of the ramp. I can see through the ejection port area where the contact being made between that part of the barrel and that part of the frame with the slide locked back when I move the muzzle end of the barrel front to back. Of course, I am doing this with no magazine and no ammo in the pistol.

Want to know if this peening or wear mark is normal on MK9 or MK40. Anyone else have this. I hope I was able to explain the location okay. Thanks.