What does 4x40 scope mean on an airsoft sniper scope?

Question

What do these dimensions stand for?!

Answer 1

The 4 means the level of zoom, which is 4 times. the 40 stands for the millimeters of viewing range that you have at the exit of the scope. the ocular lens that you look out of will be 40 mm. My preference is a 3-9x40, which can cycle through 3-9 times magnification, i use it on my UTG L96 sniper.

Answer 2

He's right, but that magnification on an airsoft gun is excessive, i would recomend a 2x zoom or less with a red dot, because we all know airsoft guns, even snipers, are not as accurate as a berrett .50 calliber rifle.