The Battle Arms Development BAD-QRRP quick-release Rear Takedown Pin is an innovative solution designed to enhance the functionality and compliance of your firearm in California. Specifically engineered to work seamlessly with BAD's California magazine lock (available separately), this takedown pin facilitates the most efficient and rapid California-compliant magazine changes possible. Replacing the standard factory pin, the BAD-QRRP offers dual operational modes - reload mode and takedown mode. In reload mode, the pin can be partially extracted from the receiver, a feature that is intentionally designed to prevent complete removal. This action allows the upper receiver to elevate just enough to disengage the California magazine lock, enabling the magazine release button to function so you can swiftly drop the magazine. Importantly, the BAD-QRRP ensures that the upper receiver does not open excessively, maintaining the integrity and safety of the firearm. For maintenance or cleaning, a simple 180 degree twist of the BAD-QRRP transforms it into a conventional takedown pin, allowing the rifle to be fully opened. This dual functionality not only enhances the user experience but also ensures compliance with state regulations, making the BAD-QRRP an essential upgrade for firearm enthusiasts seeking both performance and legal adherence. Dual function Effortless pull mechanism CNC machined Equipped with a detent and spring mechanism Manufactured in the USA