Can you get a better picture? That looks like a rooster that haven't feathered out yet so his neck looks longer. I would guess he's a production red.
Could be a dual purpose
I meant a dual purpose bird instead of a red broiler. To explain the slower growth. He looks like a production red but I was saying perhaps he's a dual purpose bird based on the slightly slower growth and those giant legsΑ dual purpose red broiler? What traits a red broiler has that makes you assume this?