Fostech lightweight magnesium upper - Fostech AR-15 Mg/Al Alloy Upper Receiver Stripped

I waited nearly six months for the arrival of my two Fostech super lightweight AR-15 uppers that are at the core of my current builds. When they finally arrived I noticed that the package claims a weight of 4.4 oz, yet both tip the scales at an even 4.9 oz. Significantly delayed and not as light as stated but nevertheless I am delighted since there is no other upper as light as these Festechs. They were well worth the wait. Mated to Fostech lowers bought last December and with other lightweight components my wife's and my ARs are incredibly light and a joy to shoot. Who could not love an AR that weighs only around 4 lb?