Chuck, I believe that the Essencia or an identical gun made under the maker's name could be specified to have the breech balls brought into control to match the .410 barrels. Possibly, your friend's gun was made that way. If he doesn't like it, the balls can be trimmed and reengraved and barrels restruck to conform with a trimmer profile. Of course, it will never be suitable for a 28 gauge barrel set after the modification, but it will look like no other double gun.