I hope the subject heading didn't get your hopes up too much...KWC doesn't currently have a Colt M1903 Hammerless airgun in production, but I had a few minutes to spare and decided to send KWC an email saying that they should consider making one.
The Sales Team rep who responded said that he'd pass my suggestion along to their "internal" department, which was the answer I expected, however he also asked if I could kindly tell him why I would choose that particular pistol and to let him know why it's a favorite, which I thought was "hopeful."
In my response I mentioned its use by officers in the US Army and Airforce from WW2 into the 1970s and that it was a favourite of criminals/mobsters/gangsters of the 1920s/30s, such as Al Capone and John Dillinger.
If you'd also like to see one go into production, feel free to send them an email:
sales@kwcgun.com