Product DescriptionThe Bushmaster M4 Patrolman&';s Complete Upper Receiver is built as a durable, reliable core component for AR-15 platform rifles. Chambered in 5.56x45mm NATO and fitted with a 20 inch barrel, this complete upper assembly is designed for shooters who want a proven configuration for building, upgrading, or maintaining their rifle. Finished in black and made in the U.S.A., it features a complete upper receiver and barrel assembly with M4 double heat shield handguards for a familiar feel and dependable performance.Product Highlights Complete Bushmaster upper receiver assembly designed for AR-15 platform compatibility Chambered in 5.56x45mm NATO with a 20 inch barrel for a classic full-length rifle setup Black receiver, barrel, and handguard finish for a uniform tactical appearance Includes M4 double heat shield handguards for improved handling and heat protection Made in the U.S.A. with Bushmaster&';s focus on durability and reliable performance Specs Brand: Bushmaster Manufacturer Part Number: 0040008BLK UPC: 604206200259 Product Type: Complete Upper Receiver Caliber: 5.56x45mm NATO Barrel Length: 20 in Barrel Length Range: 20 in to 20.99 in Firearm Fit: AR-15 Gun Platform: AR-Style Firearm Type: AR Platform Barrel Finish: Black Receiver Finish: Black Handguard Finish: Black Handguards: M4 Double Heat Shield Weight: 4.64 lb Country of Manufacture: USA Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.