I noticed this wear mark (circular shaped mark in photos) on the inside of the frame on my new G20 Gen4, using a Lone Wolf stainless steel guide rod and 22lb ISMI spring. This is after only 100 rounds. None of my other 10 or so Glocks have wear marks like this, including the two that have aftermarket steel guide rods. Should I be concerned?
https://s26.postimg.org/8620ubum1/IMG_0487.jpg
https://s26.postimg.org/du8bl7r8p/IMG_0488.jpg
