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6065 or 7075 - which aircraft-grade forged aluminum alloy is best for AR-15 lowers? Selecting a grade is one's task on finding a balance between performance and cost. A good place to start is by understanding similarities and differences between 6065 and 7075 aluminum alloy. Similarities:The two alloys are very similar. They have the same agents such as magnesium, silicon, copper, iron, zinc, titanium, manganese, etc. Both are heat treatable. Differences:The real d... Read more