I just bought a new G21. Took it apart and noticed that the metal from the front frame rail shows through the frame at the bottom u shaped dust cover part. At the front where the slide impacts the frame there is a couple of spots (one on each side) where the metal is showing. I tried to do a search on this but I did not find much. Is this anything to worry about? Is this normal to be able to see the metal exposed between the rails on the Gen 4 G21? I tried to post pics but my phone keeps kicking it out. I will post pics tomorrow when I'm on my home computer.