I already have a set on my 556 Classic. Need a set for my 522.jnathanj33 said:I have been shopping around for the last three weeks and no one has them in stock. fyi- top gun supply website stocked them for a while and you can get the front sight from aurora industries website but no rear sight. thought I would pass this on, as I am in search of a set too. good luck with the search, if I find some I will advise by posting here.