The GL-MAG incorporates an inconspicuous/sleek M4 Magazine Carrier. Whether it�s your accuracy or numerous target engagements you can depend on your last ten chances with FAB�S Survival Buttstock w/Built-in 10 round Mag Carrier. - Advantages: - Sleek design with no protruding parts will not get caught on gear or webbing - Keeps all of the characteristics of the M4 buttstock while incorporating a State of the Art magazine carrier - Positioned close by for convenient mag change providing you with the edge you need - Incorporates a quick release button for swift magazine change - Does not interfere or change � buttstock to shoulder� positioning - Accepts the ARP SRP or MBA buttpad replacement options (sold separately) - Integrated ambidextrous quick detach rear sling swivel connectors - Fits on Mil-Spec tubes only - Made with fiberglass reinforced polymer composite - Compatibility: All standard 5.56x45 (.223 Remington) M16/M4/AR15 magazines