Astartes Backpack Ammo Supply
Many weapons require larger ammunition sources to function during extended battles. A backpack supply fits over the standard backpack power unit on Astartes power armour. For energy weapons, the supply is a massive battery or charge-unit. For flame and plasma weapons, it consists of volatile fuel tanks or canisters. Other ammunition packs are simply stacks of regular rounds with a feeder line that links into the weapon. Backpack supplies hold 100 rounds of ammunition for Plasma, Melta, and Las weapons, 250 rounds of ammunition for SP or Bolt weapons, and 75 shots for Flame weapons. A weapon connected to a backpack supply uses that supply for its ammunition and ignores its normal clip size. Backpack Ammo/Power supplies weigh 40 kg and are automatically issued with any heavy weapon.