Another Molon post that should be a sticky!
Wayne is dead on! Thanks for the empiracal proof here Molon. LTC Chuck Santose is legend both in Nam and in Internet lore - still the old AR-15L lives on! Was waiting for him to be brought in the mix.

50m has the feel of what state side is all about. Even LAV, as mentioned earlier, would be first to mention there are good reasons for different zeros - "just know them and understand why!" His +/- was not to do a 25m and for longer range engagements aka Afgan...100-200 might be more appropriate.