I have braced frame, high caliber rounds, counterbalance. Serves me well enough.
PSA: I'm sure everyone interested here has already completed challenge mode, but once again; You don't have to stun Aksis every round. If you miss a stun you can go to a pillar so long as you don't miss the supercharge.*
*If I had to guess you can also miss the supercharge and stun. The game probably just looks for 'supercharge ≥ stuns.' However, I haven't tested this theory.
PSA: I'm sure everyone interested here has already completed challenge mode, but once again; You don't have to stun Aksis every round. If you miss a stun you can go to a pillar so long as you don't miss the supercharge.*
*If I had to guess you can also miss the supercharge and stun. The game probably just looks for 'supercharge ≥ stuns.' However, I haven't tested this theory.