It would not be OP in trials because 1. It dosen't go for full double damage in pvp it goes from 44 to 62 or slighly higer/lower dependant on light level. 2. When you are at your last shot the gun's recoil increases BIG TIME multiplied by the recoil you are taking from enemy gunfire, so you will probobly miss many shots and you taking away your health. 3. There are other much better pvp exotic wepons out there and if you are shoting with the last bullet you are doing the enemy a favor by taking away your own health