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Old October 5, 2012, 07:51 AM   #19
Senior Member
Join Date: November 2, 2007
Location: Northern Orygun
Posts: 4,923
I thought it was some kind of steel. Guess I was wrong.
No problem, everyone starts from scratch knowledge wise.

The AR upper and lower is typically made from forged 7000 series aluminum. There are odd balls. Extruded aluminum, cast aluminum, carbon fiber, and polymer.

If you watch for used parts you can build a upper for as little as $200-250 less BCG.
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