I cleaned my new Ruger SR-556 today... it has never been shot, at least by me. I noticed in the chamber what appeared to be brass shavings all over and after dissembling the gas piston heavy fouling which in my opinion would have taken several rounds. The bolt face has what appears to be brass residue and shavings on the face and around the extractor. The feed ramp on the chamber looks to have copper fouling. Does Ruger run several mags through the gun before shipping their SR-556s out? Am I just freaking out? I want to make sure before I ask the gun shop what the heck.