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Aluminum

Hi Collin, both the upper and lower receiver are made from Forged 7075 T6 Aluminum. Stay safe & have a great day!

Hi Collin and welcome to the forum. Upper and Lower are Forged 7075 T6 Aluminum. Complete Specs here: Del-Ton 316L Sierra Specifications Brand: Del-Ton Inc Category: Tactical Rifles Model: 316L Sierra Caliber: 5.56x45mm NATO Stock Finish Group: Black Capacity: 30+1 Stock Material: Synthetic Action: Semi-Auto OAL: 32.62"- 36.37" Hand: Right Sights: None, Picatinny Rail Barrel Finish: Black Manganese Phosphate Muzzle: A2 Flash Hider Twist: 1:7" Gun Platform: AR-Style Magazine Type: AR-15 Grips: Black A2 Handguards: 15" M-LOK Free-Float Receiver Material: Aluminum Stock Description: 5 Position M4 Barrel Description: 4140 Steel Barrel Length: 16" Receiver Finish: Black Hard Coat Anodized Stock Finish: Black Cheers, stay safe and enjoy!