Almost all of the old single shot guns used sand castings for the recievers. Stevens, Iver Johnson, really any old break action shotgun made in the US is likely to be a casting. Generally when you remove the barrel or barrels and look inside the bottom of the action you can see the unfinished surfaces that will shot mold lines and a rough texture due to the sand mold.
I’m pretty sure even the original Ballard rifles were sand castings. Been going on a long time.
