This is my first post and I don't know much, so take it easy on me... I ordered a barrel shroud off of ebay. I was trying to put it on the other night, but I ran into some trouble trying to remove the rail under the barrel. I think I am supposed to take off the bottom rail, but the bolts holding it on seemed to be stripped. None of my allen wrenches will fit it. Has anyone had this problem before, or happen to have any suggestions on what to do?