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Hi Rene and welcome. The Upper/lower are Forged 7075 T6 Aluminum. Details here: https://www.radicalfirearms.com/product-p/fr16-5.56soc-15rpr.htm

Hi Rene, yes both the upper and lower are Forged 7075 T6 Aluminum. Full specs here radicalfirearms.com/product-p/fr16-5.56soc-15rpr.htm Stay safe & have a great day!