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Hi Daniel and welcome. The upper and lower receivers are made from high-quality polymer. ***ATI Omni Hybrid Maxx Specifications***: Manufacturer: ATI Model: Omni Hybrid Maxx Caliber: .300 Blackout Barrel Length: 16" Capacity: 30 rounds Finish: FDE Upper Receiver: Polymer Lower Receiver: Polymer Hand Guard: M-LOK Stock: Alpha Stock Grip: A2 Pistol Grip Sights: None Trigger: Standard Weight: 6.25 lbs Overall Length: 33.5" Twist Rate: 1:8" ----------- Cheers, stay safe and happy holidays!