I would guarantee my own satisfaction by carting my 28 gauge Repro to New Britain and trying barrel sets until I found one that fit. If I owned a 20 gauge Repro, I would have made that trip long ago to try 16 gauge barrels. The price isn't unreasonable, it's a bad fitting barrel set that would be unacceptable. I have seen 16/20 two barrel sets from the Skeuse shop that had horribly fitted extension ribs.