I made the mistake of using some russian ammo with steel casings. During the course of fire I had a casing become lodged in the chamber after the round was fired. The extractor pulled it about 1/8th-1/4 of an inch out but it wouldn't come out without a punch rod ran through the muzzle. I can't tell if there was any damage to the chamber or not. Looks like maybe some scratches in the chamber, but I'm not completely sure. Should i contact bushmaster about this and send my rifle back? I've also noticed some scuffs on the feed ramps where the black coating is now showing a brass/copper color...is this something I should be concerned with? I've never seen anything like this, not even with my issued M4 which has had 1000s of rounds through it.