From my understanding, aslong as the scope (airsoft or real firearms) fits on the gun, it will work. However, real riflescopes will be of a higher quality in clarity and durability. So why do airsoft players use airsoft toy scopes?
Ive been doing some scope research and this site came up http://www.barska.com/
They are currently doing a 50% off sale. Everyone should take a quick peek at it