The ATI AR15 Multiple Caliber Stripped Metal Reinforced Polymer Upper Receiver gives builders a lightweight yet durable foundation for a modern AR-15. This Omni Hybrid design uses a patented metal-reinforced polymer construction that accepts standard mil-spec parts while keeping weight to a minimum. The stripped configuration arrives ready for your choice of forward assist, ejection port cover, and charging handle, making it an adaptable starting point for custom builds across multiple calibers.

Ideal for range use, training, and general-purpose rifle builds, this upper receiver supports popular AR-15 calibers such as 5.56mm, .300 BLK, .22 LR, 6.8 SPC, and more when paired with appropriate barrels and components. Its optic-ready top rail and compatibility with standard AR-15 lowers make it easy to configure a rifle that matches your preferences for handling and performance. American Tactical’s hybrid engineering focuses on strength in critical areas while maintaining a streamlined profile that reflects the brand’s commitment to practical innovation.

Key Features:

• Manufacturer: American Tactical
• Model: Omni Hybrid AR-15 Stripped Upper Receiver
• Caliber: Multi-Caliber
• Condition: New
• Action: Semi-Automatic (AR-15 Platform Upper Receiver)
• Finish Color: Black
• Barrel Length: No Barrel Included
• Optic Footprint: Picatinny Rail
• Unique Features: Metal-Reinforced Polymer Construction, Accepts Standard Mil-Spec Parts, Lightweight 7-Ounce Design
• Threaded Barrel: Compatible With Threaded Barrels When Assembled