My experience with a 1909 Fox CE is typical. After a stuck wad induced barrel bulge, I tried twice to fit orphaned barrels with no luck. There are just too many variables. The breech width is a big one, and very few sellers are unable or unwilling to provide a precise micd measurement of the width. I have several Foxes, and no similar gauge barrel from one fits any other, even ones from the same year of manufacture.