Almost as advertised - Fostech AR-15 Mg/Al Alloy Upper Receiver Stripped

Received my upper and am very pleased with the fit, finish and weight! Packaging states 4.4oz. I put it on a scale and got 4.55oz which is lighter than my 5.3oz aluminum reinforced polymer stripped upper from KaiserUS. CLEARLY STATES USE A BARREL ROD for installation to eliminate catastrophic failure (cracking the upper). Don't know why one reviewer called it "Chineseium"... It's a magnesium alloy. READ AND FOLLOW INSTALL DIRECTIONS instead of blaming the product for personal inabilities. Pairing this with a carbon fiber lower for the ultimate ultralight AR-15!