A magazine locking assembly is provided for preventing removal of a magazine from a firearm having a receiver, a magazine, and a bolt carrier assembly a without disassembly of the firearm. The locking assembly includes a magazine block assembly secured adjacent the magazine well of the firearm, a magazine safety pin for securing the magazine block assembly adjacent the magazine well of the firearm, a safety pin cover movably attached to the firearm adjacent the bolt carrier assembly for concealing the safety pin head of the magazine safety pin, and a cover detent pin configured to engage the safety pin cover passageway to prevent the safety pin cover from moving. When the magazine locking assembly and firearm are in an assembled configuration the safety pin cover conceals the safety pin head of the magazine safety pin and the bolt carrier assembly conceals the cover detent pin.