Support's Ammo Sharing Perk questions

I love the idea of the Support being able to share ammo, god knows it would have helped in many games on HoE in KF but how exactly does it work? Is there a specific amount of ammo allowed to be shared each round? Could one person take all the ammo if they wanted to or is there a set amount that each player can take per wave?



Furthermore, and probably people who were paying more attention to the gameplay than I could answer this, but does the ammo that team mates take come right from the usable ammo pool of the support class or is that something separate?