Assuming it is a purebred Barred Rock, I THINK the color of the wing feathers indicates that this chick is female. Males get more white in the feathers than females do, so the males overall look lighter. I would wait for it to grow longer before being sure.
But since your got it from Tractor Supply, and they sometimes have mis-labeled chicks, I would definitely wait longer to be sure of the gender.
A female Barred Rock is darker than a male Barred rock. But a Black Sexlink male looks very much like a female Barred Rock at that age. So if the chick was mis-labeled, it might not actually be a Barred Rock (a person could have put the chick in the wrong bin by mistake, or in some stores the chicks themselves can fly from one bin to another.)
But since your got it from Tractor Supply, and they sometimes have mis-labeled chicks, I would definitely wait longer to be sure of the gender.
A female Barred Rock is darker than a male Barred rock. But a Black Sexlink male looks very much like a female Barred Rock at that age. So if the chick was mis-labeled, it might not actually be a Barred Rock (a person could have put the chick in the wrong bin by mistake, or in some stores the chicks themselves can fly from one bin to another.)