Actually I can suggest a few. first Iron Boots give a great stomp for physical damage, followed by Rapid Destruction for an AC or Auto Cannon effect as a long range shoulder mounted weapon.
Then for arm mounts there is the Metal Piercer, both in 6 and 9 barrel set. It requires some energy to use like the Rapid Destruction but again a great Auto Cannon type weapon for 2-4 range effect. The Rapid Destruction is of course 3-6 range.
All of these don't require use as an energy weapon, more cannon or ballistics, yet at the same time too depending on play can compensate for not generating heat, although in turn getting struck by heat generated weapons is a different story.
Mind the range, and also what you are going up against and well battle should be good. MM is another thing though.
Keep in mind the weapons I suggested are only two turn limit use. A little applied thinking like a composer to a symphony and you have a good gun set build for a physical damage mech.