BudsGunShop.com - Material its made from

No, the upper and lower reciever are both 7075 aluminum. As is the handguard.
Full specs on this model on DBs website here
https://diamondbackfirearms.com/portfolio/db15wsb/

Steve, both the upper and lower are Forged 7075-T6 Aluminum Upper/Lower Receivers. Diamondback Aluminum M-LOK Hand Guard - Shot-Peened, MPI Mil Spec 8620 Bolt Carrier - 6 Position Standard Collapsible Stock - A2 Pistol Grip - Overall Length 32.5" Collapsed / 36.25" Extended - No Sights, Optic Ready - Made in the USA

The upper and lower receiver are aluminum. the only plastic on this it the stock and pistol grip, everything else is some kind of metal. I don't own one but I've heard some pretty good reviews on diamond back AR's. Hope this helps.

The pistol grip and stock are plastic but the receiver and handguard are aluminum.