Bushmaster 0020010BLK M4 Built Lower Receiver

The Bushmaster M4 Built Lower Receiver (model 0020010BLK) is a fully assembled, FFL-regulated component that serves as the serialized foundation for modern sporting rifle builds. This lower receiver is designed for shooters, armorers, and tactical professionals who demand a reliable platform capable of accepting standard M4/AR-15 upper assemblies. It is important to note that while it is designed for compatibility, some upper receivers may require minor adjustments for optimal fit.

Built to military specifications, the Bushmaster lower receiver features a rigidly-machined aluminum construction that ensures dimensional consistency and reliable cycling across various environments. The integrated trigger assembly pocket, magazine well, and control group housing are precision-finished to mil-spec tolerances, enabling compatibility with standard AR-15 upper receiver assemblies. The black anodized finish provides durable corrosion resistance and reduced light reflection, making it suitable for both duty and precision applications.

Law enforcement, military personnel, and civilian shooters rely on Bushmaster lower receivers for both patrol rifles and precision build platforms. The FFL designation means this component must be transferred through a licensed dealer, ensuring compliance with federal regulations. With a weight of 2.92 pounds, the lower receiver is designed to distribute weight efficiently, enhancing the overall balance and ergonomics of your rifle setup.