I'll try to make this as short as possible . This last winter I lent my sister my .22 remington because they had coon problems . I have finally gotten it back from her , but now 3/4 of the barrel is covered in rust . She left it out in her vehicle for months with the window down....needless to say I'm not happy and don't know how , or even if I can get this gun to look at least somewhat presentable . I've tried regular gun oil , and now am at a loss as to how to fix this . Any suggestions would be great....it's not an expensive gun...but I can't afford to go out and buy another one . At least now I know to never lend out any of my guns !