Hey guys, I just picked up my first 45 ACP. A GLOCK 21 GEN 4! Brand new! Anyway, this is not my first glock, however it is my first gen 4. Everything looks great, I just have a few questions for you folks who are way more experienced than I am. When I did the field strip of the weapon everything looks fine, except I did notice to very very slight wear marks where are Glocks can typically peen. I also noticed some slight marks on the underside of the barrel, again these marks are very very slight I was just wondering if they are from the new recoil spring? I plan on shooting the hell out of it this weekend, and I will let you know how everything goes. Thanks!