Help me understand the adrenaline shield

Let me get this straight, the adrenaline shield when on absorbs damage taken until enough shots have been fired to completely drain and now you take actual damage from your 500 hp regenerative shield, and when you get a kill your shield partially regenerates based upon your certed rank. My question is how health does the adrenaline shield give you before you take damage (143 dmg bullets).

I'm pretty sure it is exactly the same as the Nanite Mesh Generator, which gives you 500 health.

This explains all shields in depth:

The mechanics are exactly the same as with the NMG, the only difference is the shield regens slower over time but refills X% of it everytime you kill someone.

Works best with high mag size weapons.

Why I use it with my MCG.