https://mwo.nav-alpha.com/mechlab?b=c5099782_HBK-IIC-DW Quirks - heat, cooldown, ballistic cooldown, HML HSL, laser range. Not bad.
Yep, I was playing around looking at this build too. Honestly I think just in terms of range synchronicity it might be better to go 5xERML, but either 5xHML or 5xERML both look pretty niiice. Max out cooldown in the skill tree to get the HAG firing as fast as possible!