'Skuzme, but would someone enlighten me on "scale frames?" I clearly understand the Parker system where a heavy gun was built on a particular size frame, a mid-weight gun on the next size smaller, and a light gun on one smaller yet. So, which is the gauge scale frame? Can we ever put 20 gauge barrels on a true 28 gauge scale frame? If not, then all two gauge sets have to be built on the larger gauge frame?