I recall that there was an Onyx Sporting about 15 years ago, but only with 28" barrels. Differences were rib width and only 2-3/4" chambers (field guns were all/mostly 3" chambers). The Sporting models were heavier than the Onyx field. Somewhere I have an old Beretta catalog that showed these models, but can't lay my hands on it right now. If I can find the catalog, I'll post some details. Might just be a memory trick, though.