I bought one of these hoping it would work for both my Glock 17 and Glock 19. I am using a Surefire X300, not the U model. The holster works well with both guns, but that's not all. I can also put my Glock 35 and my Glock 41 in the same holster. The holster fits well, and you can holster the gun without the light in place. I removed the paddle and used the belt loop that was enclosed. So you can use it with most frames, and the regular X300 as well as the U model.