The finish is the pack's exclusive weapon pattern, the bonus for buying the game before launch, and it is repeated on the pistol and the DW9 SMG in another image from the same pack. Provisional name: Rockstar has not named the base weapon. Its shape resembles the MAC-10 and MAC-11, compact American submachine guns common in 1980s action films, the decade the whole pack looks back to.
Where
Official Vintage Vice City Pack image, "Exclusive Looks" (Rockstar site).
More smgs
Sources
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Silhouettes for entries without an official image: game-icons.net (CC BY 3.0) and Phosphor (MIT).