Gas Keys?

[Venix]

So even though I did not get them super cheap, I have managed to get a bolt ($60) and a carrier ($70), but I do not have a gas key. Anyone have one laying about or know of a place to get one? Does it matter what brand goes with which parts? This build of mine will be a total Frankenstein. I think I have ordered pieces from 20 different shops in order to build one rifle,

[Trick Pony]

Bravo Company shows them in stock with screws for $21.95. Might want to call them to make sure they are really in stock.