Torquing down the buffer tube on the UBR is not near as critical as a standard tube. I don't really see any way way it can come loose because of the way it goes together. I do put a little grease on all my threads that dont get loctited. Thats one because I'm constantly putting on and taking off parts. and the easier the better. I also put a little oil on the tube . Some times the outer tube will bind on it if you don't.