Not necessarily. In the OVA they show the Gundams carrying large packs on their back, much heavier than the Hammer. and the 100mm fits onto the side of the rack.<br/><br/>(http://mahq.net/mecha/gundam/08thmsteam/lineart/rx-79g-storagecontainer.jpg)<br/><br/>But if you do not wish to carry a 100mm. that is perfectly acceptable.