Clan Ultra ACs fire burst of smaller rounds unlike the IS versions. He's only packing 3 tons of ammo for it in reality.
Youre mistaken this build uses the classic AC-20 which works exactly the same as the IS version, its not UAC.
As per Smurfy U-20 is 1 more heat 7 vs 6 U-20 better cooldown of 4 vs 4.7 sec U-20 also 1 less slot 8 vs 9 otherwise same stat's. Biggest pain is UAC can JAM... but all in all think I would pretty much take UAC over standard AC any day especially in Summoner P. Boosted fire comes in handy enough. And both Cannons fire stream of rounds. I go back and forth between this build and Uac10 with LRM10 for no LOS shooting.
