I've been checking every gun parts site and using every combo of wording I can think of in various search engines trying to find steel sights, preferably back-up or at least detachable no biggie either way, that are calibrated in yards not friggin meters. I know the military uses meters, and it's easy enough to convert the units, but seriously? It's just annoying, this is America, we think in football fields, or at least I do. Anyway, I want to use my AR for long range service rifle matches, and they shoot out to 600 YARDS. Does anybody know a manufacturer of such a thing?