Fab Defense has an M4 carbine stock with a built-in magazine carrier that looks pretty handy.
The GL-MAG M4 Survival features a sleek 10-round magazine carrier that incorporates a quick-release button for swift mag changes.
It will not interfere or change buttstock-to-shoulder positioning and accepts all standard 5.56mm M16/M4/AR15 magazines.
The M4 Survival has ambidextrous, quick-detach rear sling swivel connectors and fits on both Mil-Spec and commercial tubes.
You can read the full article on Recoil Magazine’s website.