Centurion Build I've been having luck with. Wanna steal kills? Try this SRM + Artemis shotgun that runs 98 kph. The best part is everyone will try and shoot your Autocannon arm off first.
http://www.mechspecs.com/forum/index.php?topic=897.0 Just a variant of this one but you replaced SRM6s with SRM4+A which is the same weight and slots.
Excuse me, but I didn't say anyhing about cooldowns, did I? Still the build is a variant of regular SRM6s, easily exchangeable and that build had already been posted. Lower cooldown, burst and spread is the only difference.
4/5, Started leveling this mech with the 3xSRM6+A build; switched to this for the more manageable heat and ammo situation. If you're going to level this, it's a relatively low-pain way to do so.