Ruger Mark IV frame only for custom builds?

I've bought MKIII and 22/25 frames from drfrankenruger. The frames I believe come from builds where someone wanted VQ frames or bought a Lite just for the upper and this company sells the leftovers. Since MKIV platform is still new enough that there aren't any aftermarket frame options so there isn't a reason for there to be a surplus of frames. I'm sure once that changes, drfrankenruger will be the place to go.
 
I believe Wirthwein has a few take offs for sale.

They do a lot of transactions through ebay, but also have their own site. Just be aware they are a Wed-Sat operation (closed sun, mon and Tue).
 
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