Yes with the waddles and what looks like colors on the body showing in several places other than the neck area I would be counting on a boy. I’m no expert but I do have 32 Black Copper Marans and 5 of them are boys and I have culled several others.
This was my BCM cockerel from last years chicks. He is about 5 or 6 weeks old in this picture. I was told by a BCM breeder that only the males get the copper tips on the wing feathers. I hope you can see his copper tips good in this picture. Some times females can have some leakage, but supposedly if its like this little guys thats a for sure sign its a cockerel.
Sad to say you guys were right. The little thing is being extremely aggressive and beating up on his "little sister" the buff orp baby. I tried to separate but then they get super stressed and scream for each other she jumps up and fights back though so i hope I don't find out they're both boys.
I've had the WORST luck with sexed chicks at the feed store.
Fighting isn't an indication of a chick's sex. Males and females play and play at fighting to assert themselves into a fairly rigid social order. Marans can sometimes be a bit tricky, but I don't think I've ever had a pullet develop a comb or wattles that large so early. Additionally the legs are very thick, especially in the second image. Generally pullets don't show a lot of the red/copper in their hackles as quickly as cockerels. If you get any copper feathering in the saddle area you've most certainly got a young male.