I recently picked up a KF USPF40. I also own a 9mm compact and fullsize. I noticed some differences in this gun. It has the white dots on both sides of the sights. Why is this? I've attached a pic but it's hard to see. Also the top of the barrel hood (locking lug) is shiny. Looking at the rest of the gun (very minor wear) it appears to have come this way. Anybody else have one like this? Was this an early way they did them? thanks.