Got a 400 U because it was available, but I see many more WML holsters rated for the 300U. According to Surefires website, the length and width are the same, but are there other considerations that make a 300U-compatible holster not suitable for a 400? (I.e., height, placement of controls.)
Specifically, FWIW, this will go on my Colt Rail Gun with a DG switch.
Thanks in advance for any input.