ArchAngel, Curo, and Gunny, absolutely agree.
I keep saying, if anything now is the time to buy Holosights for dirt cheap, because of nub wagon jumpers running around with their heads cut off screaming EOTECHS ARE THE WORSE!!!!!!
In general though, any RS sight (Even the piss poor ugly ass Russian Sights I find fugly) would be more then suitable for AIRSOFT usage, as Curo pointed out.
If only nig nogs didn't nig nog, but used logic instead.