The chamber is the part of the barrel that houses a shell in the ready to fire position. Due to its slightly greater interior diameter than the rest of the barrel, it can get less of a good scrub than the barrel as brushes/mops, while tight enough in the barrel, may be a bit loose in the chambers. Don't worry about asking questions that are seemingly obvious to others, we were all at a point some time when we didn't know what chambers were. Besides, it's better to ask and learn than assume and learn.blutcherama said:When you say chamber do you mean the magazine? Sorry for such a newb question... I'm embarrassed to ask it.