Re: horus vision reticle
Yeah Lindy, PR used to do the Loopy swaps, so I think it's unavailable there anymore. I know PR used to do them in S&B, and thought that was out now, but "M4guru" on here contacted S&B and found out that they do still offer it.
NF is coming with it, but un-sure what the upcharge will be. Hedsolt offers it as well, but is a pretty spendy upgrade there as well.
I agree with Graham that it's more of a luxury than a necessity. I like them, and have gotten used to them, but could just as easily shoot a mil hash reticle instead if the Horus wasn't available.