The Knights Armament SR-15 KS-3 5.56 NATO 11.5" BBL Assembled Upper Receiver Black brings the proven SR-15 architecture to a compact, highly refined upper assembly. Its 11.5-inch cold hammer forged, chrome-lined barrel is paired with a free-floated URX M-LOK handguard and Knight’s 3-prong flash eliminator, delivering smooth handling, reduced flash, and consistent accuracy in a lightweight package.

This upper is ideal for shooters who want a short, maneuverable 5.56 NATO carbine for range work, training, or a compact general-purpose rifle build. Nearly full compatibility with other KS-series lowers means existing SR-15 owners can easily add a second configuration without duplicating components. Precision machining, the enhanced E3.2 bolt system, and Knight’s long-standing reputation for innovation and durability make this upper a dependable foundation for a premium AR-15 build.

Key Features:

• Manufacturer: Knights Armament
• Model: SR-15 KS-3 5.56 NATO 11.5" BBL Assembled Upper Receiver
• Caliber: 5.56 NATO
• Barrel Length: 11.5" Cold Hammer Forged, Chrome Lined
• Gas System: Proprietary Mid-Length
• Handguard: URX M-LOK Free-Float Rail
• Bolt: E3.2 Enhanced Bolt With Dual Ejectors
• Muzzle Device: 3-Prong Flash Eliminator
• Configuration: Assembled Upper Receiver