[IllumiNaughtyByNature]

The thumb is used a lot in self inflicted gunshot wounds. He could have had the right hand holding it and using the left thumb to apply pressure to the right thumb just before the shot?

Thinking out loud. Its the conflicting reports of GSR on one hand then on both then on none that bother me. Also the history of the weapon and its color as described by eveyone involved. Silver is not blue, blue is not black and black is not blue or silver. IMO

[Shooter 2.5]

Silver is not blue, blue is not black and black is not blue or silver.

Then maybe the conspiracy theorists will quit mentioning it. The only reason it was ever brought up is the FBI asked what kind of gun did Foster have. Lisa mentioned she helped pack a silver gun into a suitcase for Washington. The FBI agents didn't offer any information at that time to correct her. Read the interview.