Plymouth Barred Rock hen or roo?

[ChickenMamaRNx6]

All pictured here are cockerels. #2 isn't a Barred Rock, he's got a pea comb.

I've been worried about that very thing (that they're all cockerels).
The only barred breed she had were Plymouth Rock but I'm sure they've been crossed and crossed again so who knows

 

[speckledhen]

I'd bet money there are a couple of pullets in there. This one I am positive is a pullet, if it's the same age as the others. Looks just like a black sex link pullet, have created those with a Delaware over BR hens.

Some are crosses, which means you cannot go on the dark or light in the barring. You'll have to wait for the red combs to show up better. I did miss the pea comb on the one with faded looking barring because I didn't enlarge the photos that much, but I didn't see any pea-combed parents listed so maybe there are more breeds in that mix, sorry I missed that. No parents with pea combs listed in the first post, though so that one is a mystery.
I've hatched so many chicks in the past from barred birds. I had some Silver Phoenix cross chicks; all the males were barred and the lone pullet was black same as you'd see in black sexlinks because the sire was Phoenix and all the mothers were barred (passes her barring to sons only). That said, time will tell and I bet in a week or two, you will know what's what. Sexing any chick, even sex linked birds like BRs is an art, not a science.