I have a friend who just got a mosin nagant m44. The barrel under the top hand guard has corrosion/ pitting that is about 1/16 of an inch deep. Is it safe to shoot?? The rifle is from R Guns. Has anyone had any experience with their customer service. I would like to know just in case i have to return it. I went to their website and they say something about a 20 % return fee. I would appreciate any feedback.