X2 on that. It's definitely not a Barred Rock. As you can see in the pic below, all Barred Rock chicks clearly have a white spot on top of their heads.It is not a Barred Rock. A Barred Rock at that age would have a white spot on the top of it's head and noticable barring already in its wing feathers.
Googled from http://2.bp.blogspot.com/-VPsly2NCpHI/UExJh1_rS1I/AAAAAAAAAPI/i_6pwUaivHk/s1600/IMG851.jpg