I just started an AR/ Fire Aura Sent, with the idea that the Fire tier 2 " Molten Embrace" I think, (has a chance to add fire damage over time to all attacks) will fire up the lethal attacks of AR. I forgot I disliked Fire's knock back hole, but there are ways to fix that, and FA's "seemingly" lesser resist values. I don't run numbers, FA just "seems" less robust then say Invuln, Willpower or other sets. Now "has a chance" seems to be often enough to me, as the lethal attacks seem to trigger a fire dot fairly often. When I get Flame Thrower and Incinerate soon, we will see if the Molten Embrace makes me as good or better than a dual pistol running the fire ammo, or a sort of Jerry rigged fire primary Sentinel with a rifle. That was the idea anyway, and just to make AR a little less handicapped to the higher lethal resist prominence. I had not seen any AR/ FA Sent so that compelled me to try it also. Is it optimal, probably not. Is it playable and fun, and works well to chew through the stuff at plus 2 / plus 1 or plus 1 / plus 2 (what I usually run at solo till fully io set) But hey, anything can work in this game. So that is my suggestion pair AR with FA, it has been working for me.