Sandhu shot a total score of 68 with his three rounds reading 23, 23 and 22 while Chenai scored a point less in total with his three rounds reading 22, 23 and 22.
Earlier, Sandhu, playing in his fourth Olympics, rose to the third spot after the first round but drastically dropped to 13 after some poor effort in the second to take his cumulative total to 46 after the first two rounds.
Despite scoring another 22 in the third round, he slipped to the 17th position but managed to be in the fray for the semi-finals, which will be held on Monday.
Kynan, meanwhile, stood at the 25th spot after his first round but improved his spot to 16th after the second round where he scored 23 to take his cumulative total to 45.
He fired another 22 in the third round to finish the day at the 19th spot.
The table is led by Italian Massimo Fabbrizi with a total score of 75 followed by Britain's Edward Ling with 73 and Italian Giovanni Pellielo with 73 points.
The action will continue on Monday where the shooters will aim to seal a berth for the semi-finals.
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