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Old February 24, 2020, 02:10 PM   #7
T. O'Heir
Senior Member
 
Join Date: February 13, 2002
Location: Canada
Posts: 11,931
"...The particular grades of metal have little meaning to me..." Think in terms of heavy and not heavy or maybe it's not as heavy.
A milled steel AR receiver would cost a fortune.
"...AR-15's have a milled aluminum lower..." Most are cast Al(forged means the thing is hammered into shape. Then finished machined by a Computer Numerical Controlled machine.) not milled. Milling is a very expensive time consuming process.
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