Well all I know is that the zaku snipers large backpack is the powersource for the beam sniper rifle. Without it the rifle wont work due to beam weapons arent fine tuned yet in the zeon forces. Until the gelgoog comes out,beam weapons would be bulky and clumbersum for zeon because the MS's have to use a<span class="bbc_u"><strong>LARGE</strong></span>power supply for the weapon.