Quote:
Originally Posted by .45cultist
AR15's/M16's use Aircraft aluminum, and there are lots of inoperable planes around.
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Totally true, but really, for the lowers at least, even cola can aluminum would be fine. There's people out there running 3d printed plastic lowers. May not be able to hold up to the same round count as forged 7075-T6 aluminum can, but it will still work.
Not a machinist, but it looks to me like the the hardest part of machining the AR15/M16 would be the bolt carrier group.