The Pole earned his first ISSF gold medal, winning the men's 50 metres rifle three positions event.

He led throughout the event, finishing with a final score of 460.4.

Previously, Bartnik had finished 52nd at the 2010 ISSF World Championships in Munich.

"In the last two years I have been working on my mental training," he said after the final.

"I have always been able to shoot good tens.

"But I was getting nervous, stressed and then missing during competitions.

"Now I learned how to live in the moment, and how not to think too much during a match.

"That has really stepped up my game.

"That's how I went through today's competition: totally focused in the now.

"I don't even remember all of the shots, it just happened.

"Winning a World Championship title and a quota place is a dream that comes true.

"Especially because I missed it out in the previous Olympic cycles.

"I have never made it to the Olympics."

Croatia's Petar Gorsa picked up his second silver medal of the Changwon Championships, adding to his second place in the 10m air rifle event.

His total of 457.4 points was in front of bronze medallist Michael McPhail of the United States on 437.0 and Norway's Henrik Larsen in fourth.

As Gorsa had already won an Olympic qualification spot, the fourth Olympic quota was filled by China's Yang Haoran who placed fifth in the event with 427.4 points.

Slovakia's mixed trap team secured gold for the country after their individual medals from the previous few days.

Zuzana Rehak Stefecekova and Erik Varga won gold and silver in the women’s and men’s events, respectively, and have now taken gold in the mixed team final.

They hit 45 out of 50 clays to win, five shots ahead of their rivals.

"It's hard to put it into words," Stefecekova said. 

"I think the medal can speak for themselves.

"We had no idea this championship could be so good for us.

"It's very important that we won the quota place also in this event, this means a second Slovak team can compete with us in the team event at the Olympics."

Russia were the silver medallists through Alexey Alipov and Ekaterina Rabaya who finished with 40 hits and the second Olympic qualification place.

Great Britain’s Kirsty Barr and Aaron Heading took bronze but missed out on an Olympic quota place.

In the air rifle junior events, the men's event had to be decided by a shoot-off.

Iran's Amir Mohammad Nekounam and India's Hriday Hazarika were tied for the gold medal with 250.01 points after 24 shots.

The Indian shooter, who had won gold at the Junior World Cup in Suhl, Germany, earlier this year, held his nerve to shoot a 10.3.

Iran's representative narrowly missed out, with a 10.2 shot and therefore the silver medal.

Russia's Grigorii Shamakov took the bronze medal after scoring 228.6 points.

In the women's event China's Shi Mengyao took the gold, followed by Indian teammates Elavenil Valarivan and Shreya Agrawal in silver and bronze, respectively.