Souvenir 
Open in Steam 
Collection
The eSports 2014 Summer Collection
Description
Essentially a box that bullets come out of, the MAC-10 SMG boasts a high rate of fire, with poor spread accuracy and high recoil as trade-offs. It has individual parts spray-painted solid colors in a black and purple color scheme.
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FAQ
Where to sell Souvenir MAC-10 | Ultraviolet (Factory New)?
You can sell on the Steam Community Market (~13% fee, money stays in Steam) or on marketplaces with cash withdrawal: CSBoard (0%), CSFloat (2%), DMarket (2%) — lower fees and real payouts.