Aero Precision M4E1 Complete Upper Black 5.56 18 Barrel w/ ATLAS S-ONE

Aero Precision Complete AR-15 Upper Receiver Features The 18-inch barrel provides increased velocity and range while maintaining compatibility with standard AR-15 lower receivers. The 1:7 twist rate is optimized for stabilizing heavier bullet weights ensuring reliable accuracy and performance. With its anodized black finish this complete upper receiver is built for durability and longevity under demanding conditions. Aero Precision Complete AR-15 Upper Receiver Specifications Manufacturer: Aero Precision Cartridge: 5.56 NATO Make: AR-15 Style: Complete Upper Receiver Barrel Length: 18 Twist Rate: 1:7 Finish: Anodized Black Color: Black