There are two versions of the Skullcrusher .50 BMG snipers that exist.  The .50 Cal is the version associated with GTA V and is the M98B sniper.  The .50 M95 is the M95 sniper, which is in PAYDAY 2.  Why is it purple?  Purple Haze skin, that's why.

Skullcrusher .50 Cal

Skullcrusher .50 M95

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