The Antero MRD Double magazine carrier for the Byrna® HD Launcher Magazines is a must have for training, duty, and carry. The MRD (Manual Retention Device), developed by Tulster, is a user adjustable retention module which features unparalleled fitment adjustment in a precise molded carrier. Our Antero MRD Double Magazine carriers do not disappoint! Each magazine is now capable of being independently adjusted for exacting fit. No more "Tight Mag, Loose Mag" in training or on duty.