At first, drop the Tag. You dont need it. Add another Smllaser. But in general i think the punch is to soft. Your build needs to much facetime and facetank anything bigger than a Medium is a bad idea in an Executioner.
If you want Dakka i would drop the AC2's, put two UAC5 in there, add 5-6 tons of ammo and add much more smalllas or smlpls with the 7 energiehardpoint LA-Omnipod.
Use your speed and mobility to flank the enemy and shoot em in the back or the side and get cover again by using MASC.
Edit: my favorite build is UAC20, 3ER-Med, 3 Smlpls. Be carefull with the Meds when things get close and you dont have to worry about the heat.
Edited by Rayden Wolf, 01 January 2016 - 05:41 AM.