Brownells AR-15 Upper Receiver Insert Black

The Brownells AR-15 Upper Receiver Insert is a precision-machined component designed for AR-15 upper receiver assembly and gunsmithing applications. This insert provides proper alignment and support during upper receiver modifications, barrel installations, and other gunsmithing operations. Manufactured from high-quality materials with a durable black finish for corrosion resistance. Essential for professional gunsmiths and serious AR-15 builders who demand precision in their builds. Compatible with standard AR-15 upper receivers and helps ensure proper headspace and alignment during assembly processes. This tool insert streamlines the build process and helps achieve professional-grade results in AR-15 customization and assembly work.