This is what I got back from Lasermax:
We released the 4.5" XDM in 9 and 40. We can take orders at
1-800-527-3703 and ask for sales Monday-Friday 9-5 EST or on line now.
The success in the marketplace will determine if or when we will
design one for the 4.5 inch .45 ACP and the 3.8" version in 9mm and 40.
Check our web site for "new release" information as it develops. Our Uni Max
in red or green will also work on the rail of both XDMs.
Uni Max Laser UniMax Rail Mount Laser Sight
Thank you for your interest in
So I guess it is up to y'all with the 4.5's to buy them up so they will make one for me. I'm counting on you, guys, shell it out!