Hello, I was recently given a 1943 91/30 mosin nagant that my uncle picked up in vietnam that didnt come with a cleaning rod and whenever i try to put one in off of my other mosins it wont go in all the way and it sticks out about 3" past the tip of the barrel. I dont know if there is alot of dirt in the threads or what? any suggestions on what I could do to try to get the cleaning rod in?