Get ready to unjam the UAC! If it jams, you still have four MLas to keep on firing. Alternative with less DHS, 1ton more Ammo, an additional MG: testrun: Blagg
I've always been tempted by this sort of build for my blackjack, but having to get up close and personal to make it bring the pain always scared me away. I do love me my UAC5s, but range seems so important with this chassis. It does seem hard to fit anything other than MGs, AC2s, or UAC5s effectively on the blackjack so this does look like a great build to try!