This 80% lower kit comes with a standard AR-15 lower parts kit and magazine lock so that once you’re done milling the lower you can jump right into installing the lower parts kit. The 80% lower receiver is forged from 7075 aluminum and is anodized black. It features a broached magwell for easier magazine insertion and has Fire/Safe markings. The SAFE MAG from Cross Armory provides the magazine locking functionality that is required by the new regulations. A great kit to get started with building your AR-15 if you live in California!