I am really wondering if with your buggy they had an issue with and ordered a carb for it. I've seen them brand new with a carb issue that was due to bad machining. Point of that being that the only fix was to replace the carb. The place where I get my parts from has carbs that come with a 108 main jet. It is not uncommon for Tractor Supply to have an issue and have it fixed local.
Generally speaking, to adjust the air mixture screw start out with 1.5 turns out from bottomed out. The buggy should be warmed up. Experiment with turning the screw in or out until you get the best idle.
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