The barrel on a 422 or 622 is already threaded. You just take the barrel nut off and thread an adapter on. My adapter is from EKW Arms. They are available in blued or stainless (I believe) and they run about $40.
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Thanks. Just looked at mine and there does seem to be a nut over the barrel. Is there a special tool to remove this does or EKW supply one. I love this gun but have never field stripped it, yet. Would love to be able to use my Sparrow on it.
I've googled EKW Arms and can't find them anywhere. Do you have a link or address?