Originally Posted by Calgary Bill
I did a quick web search for Winchester Model 12 skeet guns and, of the ones that I found, all had WS1 chokes---I'm sure there must be some M12's with WS2 chokes but I didn't find any.
Interesting that M21 skeet shooters favoured WS1/WS2 chokes but M12 skeet shooters preferred SK1 chokes.

I just checked Dave Riffle's Model 12 book and there is lots of references to M12 skeet guns but no mention of whether it might be WS! or WS2 chokes. Looks like most were WS1 and perhaps WS2 was by special order.