Kydex Customs 1911 Magazine CarrierOur 1911 Magazine Carriers are designed to work with all real steel 9mm and . 45 ACP 1911 magazines as well as Airsoft 1911 magazines (including those that require CO2 capsules). All of our Pistol Magazine Carriers use an MRD (Magazine Retention Device) which provides adjustable retention to the front of the magazine, allowing the carrier to hold on to the magazine with the perfect amount of resistance. To adjust the retention on the Magazine Carriers