Yeah there’s no infinite ammo, haven’t gotten to the part to check out the overheating yet though. Also the 90% drop chance seems too less still, only the bigger zombies have that chance and not all of them have it. 90% means out of 10 big zombies there should be 9 with a blueprint. In arena I killed dozens. About 50 or so but I just got 8 to 10 blueprints only, which I couldn’t get at all since the player is God mode and there’s no way for him to die. Exiting the game doesn’t give you any rewards, not the blueprints at least.