I have fitted a set of Sterlingworth ejector barrels to a Sterlingworth ejector action, using one forend. I have fitted a set of Parker O frame 20 gauge A-1 Special barrels to a 16 gauge GHE Damascus action, two forends. I fitted a set of 16 gauge Special Steel ejector barrels to the same gun. I fitted a set of 12 gauge O grade L.C. Smith barrels to an OE grade Smith vent rib action. One set ejects and one set extracts. I fitted a set of 3 frame 10 gauge Titanic Steel barrels to a BH grade 3 frame Parker. I also fitted a set of 3 frame Damascus barrels to the same gun. I have fitted a set of Parker 2 frame top lever 12 gauge hammer gun barrels to a 2 frame 10 gauge hammer gun action. Luckily, I have not had to touch any of these guns with a file. None of these guns have any barrel or action overhang or poor forend fit.