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If you mean the weapon with the highest amount of bullets/second, this is the answer: http://www.youtube.com/watch?v=xe-QP8s1ZJc
However, the weapon with the highest "speed" can be found here: http://www.popsci.com/scitech/article/2004-06/rods-god The designer claim the "rods" to go 33 times faster as the sound. Which is quite a bit.
Or, if you mean on Runescape, as indicated by the question being in the Runescape Wiki catagory, the whip or the Saradomin sword