7" kits have fallen away from popularity, due to the unwieldy size of them. I ran a 7" setup for a while, but time and time again, I kept going back to my 6" setups. That also seems to be the trend in general for most competitive airsoft shooters these days.
I think one of the only sets still available from my supplier is an STI Custom Shop Ported model.
Beyond that, something can be assembled for you, using a standard 5.1 slide + comp barrel + compensator. It won't have lines as smooth as a fully integrated kit, but it will get you the size you're looking for.
Beyond that, look at the Shooters Design Limcat models... those use full length slides. But again, same issue as I'd just mentioned - the lines won't be as clean as a fully integrated kit.
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