Ruger MKIV Grip Frame, Alloy for Stainless

I'm looking for a stainless frame for a Ruger MKIV. I have a brand new black anodized aluminum frame I can offer in trade, I'm after a stainless one for the increased weight.

Willing to trade or buy outright, even a complete gun less the serialized/registered upper receiver.

For those unaware,  the frame is not the controlled/registered part on the Ruger MKI-IV pistols, the upper receiver is.