Breed? Hen or Roo?

[peptowishboon]

4 chicks about a month or so old. I’m guessing the last one may be a roo.
They are all supposed to be RIR but what do you think?

 

[Shabby Chic-Hens]

It’s too early to tell gender I think.

 

[nuthatched]

3rd and fourth are cockerels, I'm pretty sure 2 and 3 are the same picture

 

[Egg Snatcher]

First one possible pullet, the rest are cockerels. The look the be production reds. Last pic may be a Rhode Island Red