[2] He has been selected to compete for the Czech Republic in running target shooting at the 2004 Summer Olympics, and has won a total of fifteen medals under the junior category in a major international competition, spanning the ISSF World Cup series, the World Championships, and the European Championships.

[1] Caknakis trains under the tutelage of 1988 Olympic marksman Ján Kermiet for the national running target team while shooting in his native Krnov.

[1][3] Caknakis was among the youngest athletes (aged 17) to be selected for the Czech team at the 2004 Summer Olympics in Athens, competing in the men's 10 m running target.

[3] He managed to get a minimum qualifying standard of 580 to join with fellow marksman and 1996 Olympic bronze medalist Miroslav Januš and gain an Olympic berth for the Czech Republic, following a top five finish on his senior debut at the ISSF World Cup meet a year earlier in Munich, Germany.

[4][5] Upon entering the Games as a possible Olympic medal prospect, Caknakis had attained a perfect score of 100 on the third run to pull off a steady aim in the slow-target portion with 284 points.