Warhammer C is one of my favorite mechs. It can engage anything at medium range and enjoys particular (and sometimes surprising) success against Aerospace since most pilots don't expect to get hit by LBX at 700m while making an attack run. The pair of machine guns also puts pilots into panic mode as they are realizing that they just got hit by the equivalent of an LBX20 just as they start their attack run. A cloud of MRMs is the final persuasive measure to convince them to peel off, and once they do the LBX10s have reloaded and they've given you a nice belly shot to finish them off.
Against mechs, those LBX10s can add up quick, especially once the enemy gets into LBX20 range (~450 meters or closer), they can really land a solid smack, followed up the MRMs. Even better, if the enemy has a Narc on them, those MRMs chew a hole through a mech like its armor was bacon and the MRMs were piranhas. The LBX10s are then best use to exploit said hole in the armor and get a quick kill.
Beautiful machine with plenty of extra ammunition on it. When I have run out, it was only because there was a field of burning enemy assets left in my wake.