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no carbon fiber listed Model: R16M4FTT  Caliber: .223 Rem. / 5.56mm NATO  Type: Rifle  Action: Semi-Automatic, Gas Impingement System  Capacity: 30 + 1 Ships with one 30 Rd. Magazine (accepts all std. sizes)  Safety: Manual Lever with Indicator Markings on Both Sides of Receiver  Receiver: M4A4 Type Flat Top Upper Receiver  Receiver Material: Forged 7075 T6 Aircraft Aluminum with Aluminum Trigger Guard  Receiver Finish: Hardcoat Black Anodize Finish  Bolt Material: Carpenter 158 Steel  Barrel: 16" M4 Profile, Chrome Lined with A2 Flash Suppressor  Barrel Material: 4150 Chrome Moly Vanadium 11595E Steel w. M4 Feed Ramps  Rifling: 1 Turn in 9" – Right Hand Twist  Stock: 6 Position Telescoping Buttstock with Windham Weaponry Logo  Forend / Pistol Grip: M4 Double Heat Shield Handguards / A2 Black Plastic Grip  Rear Sight: None – Ready for optics or other type accessory sights  Front Sight: None – Picatinny Rail Gas Block – R

Correct Michael. Upper and Lower are : (Aluminum) Forged 7075 T6 Lower Receiver - Forged 7075 T6 M4 Flattop Upper Receiver.

The Carbon fiber gun has Model: R16M4FTT-CF1  Caliber: .223 Rem. / 5.56mm NATO  Type: Rifle  Action: Semi-Automatic, Gas Impingement System  Capacity: 30 + 1 Ships with one 30 Rd. Magazine (accepts all std. sizes)  Safety: Manual Lever with Indicator Markings on Both Sides of Receiver  Receiver: Flat Top Type Upper Receiver  Receiver Material: Molded Carbon Fiber Composite  Receiver Finish: Carbon Fiber Matte Black – as molded  Bolt Material: Carpenter 158 Steel  Barrel: 16" M4 Profile, Chrome Lined with A2 Flash Suppressor  Barrel Material: 4150 Chrome Moly Vanadium 11595E Steel w. M4 Feed Ramps  Rifling: 1 Turn in 9" – Right Hand Twist  Stock: 6 Position Telescoping Buttstock with Windham Weaponry Logo  Forend / Pistol Grip: M4 Double Heat Shield Handguards / A2 Black Plastic Grip  Rear Sight: None – Ready for optics or other type accessory sights  Front Sight: None – Mil Std 1913 Rail Gas Block – Ready for accessory