Best way to get warfront t3 set

I was wondering how to get the tier 3 set of the warfront. I got 3-4 pieces already when you finish the quest of your first warfront rotation. But completing any other warfront only rewards you the t2.

I see people with full sets and i was wondering if there was any other way to get the tier 3 mog other than the reset quest. Can non rated bgs and arenas drop t3?

Think it has to be rated.