Product DescriptionThe Aero Precision XL Assembled Upper Receiver is built for AR-15 platform projects that require reliable performance with larger diameter cartridges. Forged from durable 7075-T6 aluminum and finished in black anodizing, this upper receiver features an enlarged ejection port to improve brass ejection for big-bore applications. It includes a port door and forward assist, along with practical details such as laser engraved T-markings, a laser-marked XL designation on the receiver tang, and .250 takedown pin holes. Compatible with AR-15 lower receivers and standard AR-15/M16 components, this assembled upper is a solid foundation for a custom rifle build. Additional parts are required to complete the assembly, including a charging handle, barrel, handguard, gas block, gas tube, muzzle device, and bolt carrier group.Product Highlights Forged 7075-T6 aluminum upper receiver offers strength, durability, and reduced weight for AR-15 builds. Enlarged ejection port is designed to enhance brass ejection for larger diameter cartridges such as .450 Bushmaster, .458 SOCOM, and .50 Beowulf. Black anodized finish helps resist wear while delivering a clean, professional appearance. Includes forward assist and port door for added convenience during assembly. Features laser engraved T-markings, laser-marked XL designation, and .250 takedown pin holes for compatibility and easy setup. Specs Brand: Aero Precision Manufacturer Part Number: APAR611310AC UPC: 815421027440 Product Type: Assembled Upper Receiver Model: XL Platform Compatibility: AR-15 Material: 7075-T6 Aluminum Construction: Forged Aluminum Finish: Black Anodized Weight: 8.35 oz Takedown Pin Holes: .250 Markings: Laser engraved T-markings and laser-marked XL designation Included Components: Port door, forward assist Compatible With: AR-15 lower receivers, AR-15 port doors, forward assists, and standard AR-15/M16 components Country of Origin: 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.