i'm pretty sure they'll fit a colt cco, but there isn't much info on these magazines. have you had any problems? anyhow, i see you can get blued chip mccormic mags on cdnn for 9.99 each, and those are good magazines
i haven't even shot the gun yet so i can't say. i bought a blued kimber ultra carry and it came with one blue and 2 stainless mags and i'm a guy that likes my stuff to match.