wasnt that bad i guess. eventually figured it out. rifle is a bushmaster xm15 e2s if it matters. i noticed when i took the actual bolt out that there was a bunch of carbon on the tail of it. i cleaned that off the best i could, and looking inside the carrier i noticed some carbon build up, doesnt look easy to get to though. i have a basic cleaning kit. my uncle told me though that the carbon inside the carrier can be cleaned if i really want to but its mainly cosmetic, can someone give me a second opinion please? and thank, and also, what kind of lubrication would be best and where to put it on the inside of the bolt carrier setup would be best? thanks for your time gentlemen.