I am using the 1 inch tube on mine. I use the factory rings, and they work great. You won't be able to use the 30mm Match-dot as the rings are to close together, and the red-dot won't fit. You can use the Untra-dot 4 30mm if you get some 30mm rings. I think they make a Weaver type mount that mounts to the factory ring integral mounting on the gun. Never had a problem with my set up at all, over 7 years on my SRH 454 Casull.