Defending double trap champion Richard Faulds has failed to reach the final after a woeful display in qualifying.
Faulds posted a final score of 130 from 150 to finish in 13th place, fourteen shots behind leader Ahmed al-Maktoum.
Al-Maktoum went on to win an historic first-ever Olympic gold medal for the United Arab Emirates.
"I'm bitterly disappointed. I came out here trying to defend the gold medal
and it hasn't happened for me," said the 27-year-old.
"I put a lot of pressure on myself. I had a lot of nerves in the first round and couldn't settle. After that it was an uphill struggle.
"To be honest I'm feeling pretty upset at the moment - if there's a plane with an empty seat this afternoon I might try and get on it.
"I was confident and training last week was going really well, but I didn't
get going today, didn't get the flow I wanted.
"When that happens it's very difficult to fight back.
"I know I've got to make some decisions about what I want to do from here but
I'm not really thinking about it now."
India's Rajyavardhan Rathore won silver with Wang Zheng of China taking the bronze.
Team GB's shooting medal hopes now lie with Richard Brickell in the skeet and Michael Babb in the 50m rifle prone.
Meanwhile, Russia's Mikhail Nestruev held off a tough Korean challenge to win gold in the men's 50m pistol.
Nestruev's winning total of 663.3 points was 1.8 clear of South Korea's Jin Jong-oh, who took silver, while North Korea's Kim Jong-su finished third with 657.7.
Jin had carried a two point lead over Nestruev into the final at the Markopoulo Olympic shooting centre but the Russian took the lead after the fourth shot.
Although the South Korean reclaimed the lead after the sixth, a score of 6.9 in the seventh put paid to his chances.