There was a recent thread on SA80s that mentioned the development of the EM-2, as illistrated here: http://world.guns.ru/assault/as59-e.htm Why I mention this is because in the illustrations on this very admirable Ivan website there's a rear sight thingy on the EM-2 consisting of a sort of concentric tube device. Some time ago, I downloaded a Pathe News article about the introduction of a "new" rifle to replace the Lee Enfield. This rifle was the SLR, but in the footage it also had this strange concentric device as a rear sight. In this Pathe News article, there was also an obvious change from the rounded sticky-out penising handleof the FAL to the flop-down version that we all know and love on the standard British Army SLR. The thing is that all the SLRs I ever fired were fitted with a flip-up leaf rear sight, so this tube thingy must have been lost along the way. So my question is (or are): what was/is it and why was it ditched? I've had a real good butcher's around the internet on this in the meantime and can't find any answers to my questions. That doesn't mean they're not out there somewhere, but just that I'm too stupid to find them. Can anybody provide a helping hand?