OWB KYDEX Double Magazine Holster OWB MRD Double Magazine Holster. Carry your spare mags with you at all times. Extremely comfortable and versatile with a flexible leather spine and belt loops on both sides to accommodate your preferred carry position. Our Double Mag Holster works for both RH OWB Carry and LH OWB Carry. Our MRD Double Magazine Holsters come standard with our proprietary 1.5" Belt Loops. Our MRD Mag Holder is universal for the caliber and round configuration (single stack vs. double stack). Mag Retention is easily adjustable via the Allen Key on the MRD which puts pressure on the flat side of your mag.    Double Magazine Holster Selection: 9MM/40SW Single Stack 9MM/.40 Single Stack Magazines (up to 0.65" wide) 9MM/40SW Double Stack 9MM/.40 Double Stack Magazines (up to 0.86" wide) 45ACP Single Stack 45ACP Single Stack Magazines (up to 0.55" wide) 45ACP Double Stack 45ACP Double Stack Magazines (up to 1" wide) 380 Single Stack 380 Single Stack Magazines (up to .58" wide)