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 >>/79456/
> 7075 is your ""fancy"" aircraft grades, and it's not at all required to use that for firearms parts, 
There's a trade-off with thickness, though.  Sure, 6061 can be used instead of 7075, but the part might need to be thicker to have a reasonable safety margin.  And if the part is expected to get very hot, better not to use aluminum at all!

 >>/79457/
 >>/79464/
One day, I will visit Suomi again!