>>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!