it all depends on who it is and how they take care of it. My muzzy sit in a pawn shop for 6 months no rust, no corrousion nothing. This is because I clean my stuff the day I fire it and if it ant going out in a day or two lube the hell out of it then clean before shooting. When I pulled my muzzy out I was worried it would have rust on the outside just from being cased in a soft case for so long on a shelf. Nope nothing alittle dried oil here in and there but nothing to worry about. She looks as good as she did when I bought her.
I looked at a few old guns a few weeks ago. One a 1920s something bolt action 12ga. It was recalled for the bolt blowing out the back and hurting people. A 16 ga single shot that was uncleaned and rough and finally a cva muzzy about 4 years old that was uncleaned. I asked the boy when he shot it and he told me his buddy owned it and had not shot it since the 2007 season. WHAT THE ****. I told him I was not interested and I thin my triumph my toss it out the safe and throw the window.
A friend bought them and said for next to nothing what can I loose. Well your life, emmm your hand, umm a huge deer cause the cva shoots like a musket from the 1800s