This build can EASILY cut 2 Naramon (-) forma by dropping [Primed Heated Charge] for [Heated Charge]. Swap damage types as you see fit. Primed Faction mods also work in last slot, but as far as I can tell the damage is similar. Maxing multishot is ideal due to how [Aegrit] works (it throws extra grenades in a fan when stacking, which greatly increases AoE effectivity).
I like [Trick Mag] in Exilus slot. As long as you aren't blindly carpet bombing every corridor with two Lancers in it you shouldn't have ammo issues, though [Primed Pistol Ammo Mutation] also works if you have the resources and want to spam a bit harder.