I’m asking for a friend who is 82 years old he has a Swedish carbine that is parts matching the bolt to the receiver to the rifle however the gun will not go off it will not fire if you take the bolt out of his carbine and put it in another rifle it will fire and if you take another rifle and put it in the carbine it will fire does anybody have any idea what’s going on any tips that you might be able to help me with? Thanks