Dings and dents
I don't know about 1-4. But number 5 looks familiar. I had a ding on the bottom left of the feeding ramp facing the chamber. I had to gently smooth it using a fine file. It snagged my finger when I cleaned it. So I needed to smooth it down. Anyway It was caused by slamming a magazines during reload. It happened at IDPA shoot. So I now reload some slower and problem fixed.
About 1-4 I have no idea. Sorry. There are many very knowledgeable Kahr owners on this forum who could help.
"A gentleman will seldom, if ever, need a pistol. However, if he does, he needs it very badly!" -- Sir Winston Churchill