This thickwall action came with two sets of proofmarks on the receiver ring. I take that to mean it was a replacement. I'm not sure how you'd destroy a highwall action on a 22 short. It was not originally made for 22 use as it had no cut for the ejector parts. As for the barrel profile, it comes from Douglas.They call it their Don Allen profile. I've gotten several like this from them. I don't know why they don't advertise this design, but they'll make it if you ask.