ruger mk 22 rimfire barrel threads

[cmesic]

I am trying to find out what threads were used on the ruger 22 pistols. The onlt thing i find are suppresor threads 1/2 by 28. I want to know the threads that are at the base of the barrel. Any help would be appreciated.
Thank you.

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[Oohrah]

I don't think it would be a trade secret, you might go direct to Ruger and ask? Many years back I stripped my Mark 1 down to barrel and receiver. Can't recall if the two were threaded or a press fit, just that the two could be separated from the lower hand grip/trigger group. I'm not sure if threaded, how easy they could be separated.