Fits any pistol magazine from a single stack 9mm to a .45 double stack while maintaining a low profile. No screws or adjustments necessary. Ready to go out of the box. When you draw a magazine from the Universal Mag Carrier Gen 2 it decreases back to its thinnest profile, keeping out of the way when not in use. Note: The following mags won’t work with the Universal Mag Carrier: Kahr CW9, Kahr PM9, Sig 938, Kimber Micro 9, Ruger LC9, FN 5.7, and Ruger 5.7.