User blog comment:Staw-Hat Luffy/Gear 4, Yes Its True./@comment-25079709-20150409113250

I think it's just Gear 2 + Gear 3. He use it only once when fighting with Moria and it was his most powerfull attack pre-timeskip. Since he've been traing 2 whole years so IMO he should control it now.

What else could it be? It isn't a lot of state he could achive with gomu-gomu power