Hey guys, just bought a new Glock 17 gen 3. This is my first Glock so I just had a few questions about normal wear and tear and lubrication. Immediately I started noticing some of the finish rubbing off the under side of my barrel and was wondering if this is normal. Also, the pin/button on the front of my recoil spring guide rod is sort of loose. Like, if I take it out of the gun I can turn it with my finger tips like a loose screw. Is something I should be concerned about? And should I lubricate the guide rod as well? The spring seems to be rubbing against it and rubbing the finish off it as well. Thanks.