We never see them, but they do exist and we know they do not look like the ones in Stargate Universe
Executive producer Joseph Mallozi answered a question in his July 19, 2010 mailbag that indicated that the Ori did have Stargates, and that they were not like the ones seen in Stargate Universe.
Gabriele writes: “4. We know that in the Ori galaxy there are gates. The Priors used them to come through the Milky Way gates and probably the people in that galaxy use them to get to other planets. Is it possible that the seeder ships reached the Ori-Ancient home galaxy long ago and seeded the Destiny gates on those planets? So, is it possible that the gates in the Ori galaxy are of the same model as the gates that we see in “Stargate Universe”?”
Answer: I don’t believe they were.
If the fan was incorrect about the presence of Stargates in the Ori galaxy, I expect that Mallozi would have taken the time to correct them. His answer seems to confirm that they do indeed exist there.
