Looks like either a cuckoo maran or a barred rock. If it's legs and feet are yellow it's probably a barred rock and if it's legs and feet are white it's probably a cuckoo maran.
Agree. I'm leaning to Cuckoo Marans. Barring isn't crisp enough for a Barred Rock.
Feet look to be light grey.
Eye color is a bit light for a Marans (which should be copper colored).
Could also be a mixed barred bird. Barring is dominant, so it could be a number of things mixed with barring over it.
LofMc