The Ruger RUG 91003 AR Upper Receiver Assembled is a factory AR-15 pattern upper built to Ruger’s specifications, providing a clean, flat-top platform ready for your preferred barrel and optics. Supplied fully assembled with the forward assist and ejection port cover installed, it offers a straightforward way to complete a new build or refresh a well-used rifle while maintaining compatibility with standard AR-15 components.

This assembled upper receiver is ideal for shooters who want a reliable foundation for a range-focused carbine, training rifle, or general-purpose AR-15 without the extra work of sourcing and installing small parts. Pair it with your choice of barrel, handguard, and bolt carrier group to tailor the rifle to your needs. Backed by Ruger’s long-standing reputation for dependable firearms and accessories, this upper receiver is a practical starting point for a quality AR build.

• Manufacturer: Ruger
• Model: AR Upper Receiver Assembled (91003)
• Type: Accessory - Uppers