New release from FAB Defense which has a high chance of being copied immediately in the Far East. This is still for real steel weapons... "GL-MAG– M4 ‘Survival’ Buttstock w/ ‘Built –in’ Mag 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.