No, like I say, the type is not going to be any more valuable just because another gun of the same type was used at the Olympics.

Think about it. A model of football boots are no more valuable just because Beckham uses that type of boot are they? A pair he's actually worn would command a premium, and I would imagine he'll usually be using premium boots anyway, so they'll be a more expensive model, but they're no more valuable just because he uses the same ones.

Thing is, all the major makes and models are mass-produced. An arbitrary specimen is not in any way special because there's lots of them around. The only ones with any interest are the actual examples used in the notable competition.
Even then though, being used in the Olympics still doesn't make a gun special. To really make it collectable it would need to be used by a legend like Cooper, or be involved in a string of World Cup and Olympic successes.