The Stache IWB mag carrier is adjustable for retention by tightening or loosening the two phillips head screws near the bottom corner of the magazine. Additional friction for smaller magazines, especially metal magazines, can be achieved by installing the provided friction springs to optimize magazine retention for the user. The Stache IWB Mag carrier also includes the flexible appendix platform accessory wing, for use when mounting the Stache IWB Mag Carrier to the Stache IWB holster to create a unitary Appendix Carry (AIWB) concealed carry platform.