Again, check the link above, and there's dozens of others, BCM, Midway, Brownells, etc.
A polite call to Colt Customer Service might help, too. Why a CA legal gun is in Kentucky, no idea, but if it's new, asking for help doesn't hurt.
If money is going out of your wallet to change it, just maybe consider the Norgon ambidextrous. It's not cheap, but this is an opportunity to put what the Marines issue on it.