Your a handicap
Hahaha
What about his a handicap?
Look, only certain weapons have the ability to aim down sights.
It's like guns that make it so the light button reloads the gun. The whole script is packaged with the gun. I'm gonna take a wild guess and say the server you were on was using GCat's weapons since he's built all of his to have reloading and ADS.
You can't script it so every gun can do that.
Actually, maybe you could, it would just require a lot of first person re-positioning.