ATI AR15 Multi-Caliber Stripped Upper Receiver
Lightweight polymer upper receiver with metal reinforcement accepts standard mil-spec parts. Supports 5.56mm, 300 Blackout, 22 Long Rifle, 6.8 SPC and more. Only 7 ounces.
Versatile Multi-Caliber Platform
The ATI AR15 stripped upper receiver represents a practical solution for shooters who want to build or modify an AR platform rifle without the weight penalty of traditional aluminum. This patented design combines polymer construction with strategically placed metal reinforcement to deliver a receiver that's both lightweight and durable.
Key Features
- Multi-caliber compatibility: Accepts 5.56mm NATO, 300 Blackout, 22 Long Rifle, 6.8 SPC, and other standard AR15 calibers
- Metal-reinforced polymer construction: Critical stress areas are reinforced with metal inserts for durability
- Mil-spec compatible: Works with standard AR15 parts and components
- Featherweight design: Weighs only 7 ounces—roughly half the weight of traditional forged aluminum uppers
- Stripped configuration: Allows you to customize with your choice of barrel, bolt carrier group, and charging handle
Built for Flexibility
Whether you're building a lightweight hunting rifle, a dedicated 22 Long Rifle trainer, or experimenting with alternative calibers, this upper receiver provides the foundation for a versatile platform. The polymer-with-metal-insert design doesn't compromise on the durability you need for reliable function while keeping overall rifle weight to a minimum.
This is an ideal choice for shooters who value modularity and want to maximize their AR platform investment.
