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1.
Referring to a Colt M1911, also known as a hardballer, but when it has a nickle finish; giving it a silverd appearance.
Used in Hitman 2: Silent Assassin.
Press X to drop silverballer.
by Major Landmark August 06, 2006
 
2.
Customized guns used by Hitman, the video game character.
I was just playing Hitman and blew a guys head off using the Silverballers.
by Yuri Marklov January 13, 2009