How does one reload an AR15 if the mag is permanently installed in the lower? Remove the takedown pin & open the upper/lower like a double barrel shotgun & load from the top?
MAG LOCK AR-15 BULLET BUTTON®
Hardcoat anodized aluminum replacement for factory magazine release button permanently retains the magazine in the lower receiver to conform with California Code of Regulations §978.20(a). Prevents rapid magazine removal, so your gun can meet the requirement for a permanent, non-detachable magazine.