Don't want to hijack this, but I think Johnjeff, and I want the same thing.
My ORC, has a real swivel installed.
The bottom of the gas block does not, but it has a 7/16" smooth hole, with a recessed ridge slightly below the top of the hole. Not familiar with this at all, it MAY fit the Midway swivel shown above. If it does, someone let me know. That fixture would be great. Midway doesn't show the dimensions.
Behind the smooth hole, there is a appx. 3/8" threaded hole, which I assumed would be the location of a swivel base. Thread size, ???. Again just don't know.
Color me clueless.
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