The Fab Defense GL-MAG M4 Survival Stock has an integrated 10 round magazine carrier. The sleek design does not have any protruding parts and will not get caught on gear and the magazine will not interfere with shouldering the weapon. The stock has a quick release button for fast magazine changes. The GL-MAG stock will work with both Mil-Spec and Commercial buffer tubes. An ambidextrous quick detach rear sling swivel is built in to the stock. Made with a fiberglass reinforced polymer composite. The GL-MAG is compatible with all standard 5.56x45 (.223 Remington) M16/M4/AR15 magazines.