I set my sights, and the sights of guns I work on, for 30ft (indoors, my basement range) and that does me just fine out to about 120-150ft. I might have to aim a little higher to get the BBs on target. Once in a while I'll take my sniper rifles to the storage hut at work, and use that to sight them in, indoor distance of 90ft measured. That'll let me get out to 200ft pretty easily.
Thing with airsoft, the BBs are greatly affected by wind, so you have to watch the trajectory of the rounds and compensate for where they landed. Doesn't matter if it's a stock AEG, an upgraded GBB shooting 0.43g BBs at target 120ft away, or a 500fps sniper rifle with match grade BBs shooting 230ft away, you have to watch and compensate. If you don't you are a noob.
