I ended up with one maybe 3 of these chicks. Tractor supply must not be good at identifying different kinds of chicks. They were in a tub that said barred rocks and buff Orpingtons' this is my first time raising chicks, but I didn't think they were barred rocks by looking at the picture they had, I got 2 barred rocks and 3 without white spots. One for sure looks like this breed, I'm unsure on gender, I think pullet so I call the chick a her, shadow is around 6 weeks now, very dark black, no stripes like barred rock she was labeled as, but I've noticed she's getting a golden brown around her neck and hints of this color on her wings. She looks like some pics I saw on here, I saw a too that was colored like her I hope that doesn't make her a him. She's one of my sweetest chicks she likes to hang out on my shoulder and always wants to visit the ducklings but they're scared of the chicks. She has a comb but not wattles, but her comb isn't as big as a chick the same age as her that I'm positive is a too his comb is larger and turning red, hers is still yellow and his wattles are starting to protrude already red, he was supposed to be a buff orpington but he has black mingled in on his wings and tail, I picked chicks from the same tub since they were already being kept together and so far I think only 2 out of 8 are roos. My other two chicks had yellow spots on there face yellow chests too there two longest wing feathers are white but they seem to be staying black as they feather out but they don't look quite the same as shadow, so just because tractor supply says specialty breed straight run sure doesn't mean that's the breed you're getting. Of course I don't mind they're different its made them easier to tell apart and I bought mine as pets and for eggs they've been kept inside and handled daily they have adopted me as mama they eagerly greet me when they see me and run to me not away from me they all love to pile on me for attention
She sounds like a black sexlink and if so would be a pullet.
Post a picture and we will be able to tell more.