There are only a few single AC-20 builds others have posted and they all feature SRMs. I feel this is a pretty good 0000 build as it uses all the hardpoints -1 and is very survivable. You can sacrifice the entire left side of the mech and still be a killing machine at close quarters. Variations 4x mlas 325 STD + endo 4x LRM5 + max SHS if poor