Mark; I've seen those adapters advertized but cannot find the ad I'm thinking of in a pile of magazines I just went through. The ones I'm thinking of are made in Alaska. but I did run across this ad for Hammond Game Getters that are made in Canada.
The ad is in the Nov 2007 Rifle Magazine and they give an web address of:
www.gamegetter.caI still don't think this is what you are looking for, but it may lead you there if you call them.