They are the same gun. The shorty has a shorter outer barrel, no extended lower magazinne tube with a spring in it to store shells, and a pistol grip modeled after the Beretta M3P instead of the M3 stock.
The only differences are external, and the 2 shotguns are the same inside. Where the stock attaches is the same, since the shorty is just the normal one with a short barrel and pistol grip thrown on. It's common for people with shortys to get full M3 stocks for their guns so they can have a stock.
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