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.Specifications and Features: Description: SINGLE STACK MAG CARRIER Compatible Firearms: 1911 Single Stack Ruger EC9/LC9/LC380 S&W M&P Shield EZ 9 Springfield xDS/xDS Mod.2 If additional friction is desired, install the friction springs or try adjusting the top retention screw more than the lower screw. Friction springs recommended on fits marked