Just Google the design you want and go from there. Gentleman It might be nice to at least be capable to obtain a 15 rounder or so. In terms of other compatible manufacturers, I'd personally use Mec-Gar also. Really should be no difficulty getting them. I am hunting a Ruger https://emilionqonk.rimmablog.com/31443986/ruger-shotguns-for-dummies