American Tactical Imports AR-15 Stripped Poly Hybrid Upper Receiver Black. American Tactical Imports constructed these AR15 Upper Receivers from metal-reinforced polymer that offers the durability of forged aluminum with significantly less weight. The American Tactical AR15 Omni Hybrid Upper Receiver is one of the most versatile uppers around since it's able to be chambered for multi-calibers including 5.56mm 300BLK 22LR 6.8SPC and other calibers. These receivers accept standard mil-spec parts and at only half a pound they're some of the lightest on the market. Complete your rifle with this American Tactical Omni Hybrid Stripped Upper Receiver for a rugged platform that comes at a lower weight and lower price point. Specifications for American Tactical Imports AR-15 Stripped Poly Hybrid Upper Receiver: Manufacturer: American Tactical Imports Color: Black Finish: Matte Fabric/Material: Polymer Caliber: 5.56x45mm NATO Gun Model: AR-15 Condition: New Features of American Tactical Imports AR-15 Stripped Poly Hybrid Upper Receiver: Accepts standard mil-spec parts Multi-Caliber: 5.56mm 300BLK 22LR 6.8 SPC and others Material: Polymer w/Insert Patented Metal-reinforced polymer upper receiver Lightweight with durability of a forged aluminum upper Metal insert to reinforce critical areas of the upper Only 1/2 a pound (7 ounces) Package Contents: American Tactical Imports AR-15 Stripped Poly Hybrid Upper Receiver What firearm models does the manufacturer say American Tactical Imports AR-15 Stripped Poly Hybrid Upper Receiver is compatible with? The manufacturer suggests that American Tactical Imports AR-15 Stripped Poly Hybrid Upper Receiver is compatible with AR-15American Tactical Imports AR15 Stripped Polymer Upper Receiver Omni Hybrid