Barnes appeared in eight games for the Missions, all in relief. He had a 1-0 record with a 1.23 ERA. He converted in his only save opportunity.
The 6-foot-2 right-hander pitched in 16 games with the Brewers this season.
Barnes has made the move up and down between the majors and Triple-A a couple of times in 2019. He was optioned to the Missions on May 2. He was called back up to the Brewers on May 12. He was optioned to the Missions again on May 18.
