Hi, I am not sure if there is a trick or some thing but I can't get my factory hand guards of my Bushmaster Carbine. There are no bolts,screws or anything holding them in. I take and pull the ring down to get them out but they will not budge. Can any one out there give my some advice on taking these off? I know it has been a while since I was in the service but some thing is just not working right here. Thanks in advance.