Kudos for outside the box thinking! However, this appears to be an idea that will not make the cut for all the reasons mentioned above. Keep innovating though! gotta blast through many failed experiments to make progress, just ask Thomas Edison. 

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Has anyone seen this new patented barrel system by Wolf Precision. Supposed to be by BAT and when need new barrel, just thread on new barrel to the separate chamber mounted on BAT receivers. Wolf says that they are only ones doing this.
http://www.wolfprecision.net/new-chamber--barrel-system.html
Same brass different barrels! Good practices in chambering minimizes variations in chambers however, no matter what practices are used cutting tools wear when used, this would completely remove and possible variation in chamber so the same brass could be used for multiple barrels with the same sizing practice. That could be an advantage especially with the almost impossible to find or difficult to form brass. Just some thoughts!
How many barrels do you have to chamber with one reamer before you can recognize reamer wear in the brass?
I was thinking it would be in that ballpark as well. A non-issue.Millions id guess
Just another widget to sellLast I heard is that he has a patent on this. But, I really don't see people copying this idea. Makes no sense to me.
Paul
Take a look at the Remington model 742 semi-auto. I have two and they both have a barrel screwed into a chamber. Remington dropped this method after a short time like a hot potato! They will not even consider rebarreling or working on one. pdog2225As said, a solution looking for a problem? If it aint broke don't fix it? Novel idea, agreed