Gunsmithing Surgeon Bottom metal inlet

I think the surgeon bottom metal is a M5 inlet if I recall. So Hawkins, grayboe, or any M5 style bottom metal should work. Correct me if I’m wrong.
 
I cannot comment of the KMW piece, but if there is no alternative, I would wait for a Surgeon. I have several and they are a really really nice bottom metal.
 
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