Ken, did you ever see any of Bill Phifer's Model 21s? Some of the ones he ordered had two different gauge barrels on each set of barrels. I have pics of one set that has one barrel a 20 gauge and the other barrel a 28 gauge. Imagine the rukus this gun would create if someone saw it. He had it for sale a few years ago along with several other high grade 21s. Have you ever heard of these?