Ok, they do have gf crust (10" small only). On one hand, they bake the pizza in a tin foil pan. That's normally a good sign. On the other hand, they dough was a little undercooked. It was stuck to the pan, yet somehow burning hot. 30 min after it came out, I still could not hold a piece after peeling it off the bottom.
I've had gf beggars pizza 3-4 other times at other locations. This was my worst experience. I might still give them another try.
(I felt uncomfortable afterwards. I doubt I was CC'd. My guess is the sausage I got was not GF. The staff wasn't very knowledgeable, but on the bright side, this is the first time my gf beggars pizza came out in a tin foil pan. That made me feel better.)