The transparent cocker is real. I know someone that once owned one, and this looks to be very genuine also. It's certainly possible. And RP also fired his I believe.
I believe the tippmann is also real. People complained about it being photoshopped and I think the guy that owned it stepped up and showed multiple shots from different angles to shoot them down. Photo shopping from one angle maybe... from several... not likely.
CP had a 3 foot long barrel at the World Cup last year and may be bringing it again this year. They said they could make one as long as you wanted... but may not be able to hone the inside. The one they had seemed to shoot OK without honing...
manike