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Old February 24, 2020, 08:10 AM   #5
MarkCO
Senior Member
 
Join Date: October 21, 1998
Location: Colorado, USA
Posts: 2,874
7075 is stronger than 6061. About the only that that means is that the barrel nut can be torqued a little higher making a more rigid assembly. On lowers, does not matter, on uppers, for some, that matters.
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