So the big attraction with airsoft is that they're supposed to be realistic replicas. My M4 and HK51 have detachable magazines and the mag release, safety, and charging handles all work like they do on the real steel guns. They are of foreign origin, and in order to avoid problems with customs, they 1) had their replica trademarks puttied over and 2) each had an inch of barrel painted orange. It took me about half an hour per gun to take the orange off with some solvent. Then I threw on some nice optics, three-point slings, uprated springs and pistons... but I digress.
However, it's important to remember that BB and pellet guns are not actually required to have orange tips by federal law. State and city laws vary, of course--depending on the state, airsoft guns may be required to have orange tips, may be considered real firearms, may be outright illegal, or may have no additional restrictions whatsoever. My M9 (since stolen) and my Benelli shotgun did not come with orange paint, as they were procured locally. And of course BB and paintball guns are not sold with orange tips.
Anyway, the point is that replica guns do not necessarily have to have orange on them, and that they can, as a result, be a kind of Darwin Award catalyst when mixed with jittery cops. Still, it's important to remember that skin color seems to have a big impact on police response--white douchebags open carrying with real guns might get questioned by police, whereas black kids with toys get gunned down without warning.