Ubi patched the Breaching charge-method, this one is harder, you need premade or it's not gonna work.
Once the round starts, your team cannot have any drones on the map,(twitch was ok) or this is not going to work. You'll just break your drone.
Ask your friends to either destroy the drone or bring them to spawn so they can pick it up.
Also, you throw the drone while in prone, so the ADS accuracy is that of prone, not standing.
If you are not near an edge of the map, you can ask your friend to shoot the drone as soon as you throw it, and it works.
You cant climb ladder or throw grenades or it will be undone.
EDIT: Forgot to mention, on the enemy's killcam they can see your hands, unlike the breaching charge method. You can tell them that you were just lucky!