No scoping is an art that annoys a lot of people in PvP. Well not really, but it can come in handy since you know if it connects it’s a one shot kill.
In Destiny, no scoping is not that prevalent since there are not a lot of snipers that let you do that. However, a YouTube user has found out a way to no scope consistently well in PvP and it requires a little effort.
Get a posted paper and cut out a small piece of it. Now ADS and stick it to the center of the screen so you will know where to aim the sniper rifle. You also need to find a sniper rifle with Take a Knee perk that allows additional accuracy when crouched.
You will get a better idea when you watch the video below.