I remember looking for a rail that was supposed to be stiff, and in one of the forums I went to I saw a rail that appeard to have the same lockup as a Geissele rail, but was cheaper and I liked the design, if anyone knows what company makes them that'd be great. By lockup I mean the barrel nut and attachment were very similar in appearance. Its kinda become my white whale, I've been using my apparently weak Google-Fu to no avail. I remember the post also talked about Sgt of Arms rails.