i just purchased my mossberg ill be getting it in a few days just wondering on how to prevent that happening to miy shotgun
Even with a brand new firearm one can usually spray the barrel down and have a LOT of rust appear on a white cleaning rag. I usually work the new steel components a great amount to get this initial corrosion off entirely.
It's not uncommon for a cleaning rag to look like this upon the first cleaning-
Also, a shotgun with a ventilated rib is slightly more difficult because of the small open spaces between the rib and the barrel. I usually wet down corner pieces of rag and work them back & forth like dental floss.
I use Tri-Flow mostly because I love the smell and it seems to work very well. We were issued CLP in the Cavalry and it's always made me nauseous.