So is this

(found at http://www.oregonprecisionarms.com/?page_id=162) legal for production?
As I read the rules, the barrel section could be mated to a MkII and would probably be legal without too much room for discussion. After all, it's just a replacement barrel for a firearm that's out of production and for which new parts are not readily available from the factory.
However, when a third party buys current-production frames, stuffs them with their own parts, and then sells the result as a new, complete firearms, I get confused. I see this as an OGA pistol that just happens to use a Ruger frame as a base, just like so many 1911 shops make their pistols using frames from a small number of suppliers. However, I don't know how this particular pistol would be treated by IHMSA.
Any ideas? I'm considering buying one to use for Conventional Pistol competition and if it turns out to also be legal for IHMSA production class competition, that would be a big added bonus.