I wouldn't recommend zoom necessarily. If you can't see the rounds, get contacts before a scope. I've moved off of sights to high end irons, not that a good sight doesn't work in Airsoft. Think of it this way; you've got to get you gun/hop centered before you worry about sights. A zoom can often throw off the look of the round, so you really have to know your gun, but a red dot is good CQB unless properly paired with an iron. Good eye realized either way is a boon in airsoft. We aren't firing bullets, so forgiveness is key.
Anyways, we were talking about distance. Read Thunder's thread, it has lots of good info. If you want success, start with the right tools and go from there.
ďREALITY IS LIKE A STONE. TO MANY ITíS HARD AND COLD, THEY CANíT HUG IT OR EAT IT, IT ONLY FRUSTERATES THEM AND DOESNíT DO THEM MUCH GOOD. TO OTHERS ITíS STRONG AND DEPENDABLE, YOU CAN BUILD WITH IT, BUILD UPON IT, OR WORK WITH IT, ALSO USE IT TO SMASH PEOPLE IN THE FACE.Ē