Cuckoo Marans
At this age and stage, almost certainly a roo.
Not all bad, it is Marans, which means darker eggs, but will not be as dark as BCM.
You can use him to get to Olive Eggs if you have a blue layer, or EE, but it won't be dark....and all the chicks will be cuckoo'd (stripey) from...
Yes..I saw the barring too and forgot to comment. You likely have a Cuckoo Marans but definitely not a Black Copper.
One chance of hope for pullet, if the bird's comb is yellow and stays yellow, and the barring comes in crisp, you might have a Barred Rock, and commercial line BR pullets can...
The odd photo color is throwing things off, but I think you have a rooster. BCM roo's telecast very early. I knew at 2 weeks who the roo was in my last batch of them.
LofMc