It only took one grenade to destroy the combination lock and top section of this gate. I do not know the history of the gate but it had no visual damage.
In the video it looks like I might have placed the grenade through the wall and it dealt damage to the inside section. I'm not sure how this mechanic works though. There is also a fencekit deployed close to the gate.
If this is reproducable it will negate the new tougher base raiding system.

Video: https://youtu.be/Of8r_pz9Aec