Good starting point or dangerous liability?

[HackerF15E]

The manual lists 7076 as not weldable. I have run into welders who have told they could weld 7075 or 2024, the two most common non-weldable alloys. What exactly that means, I don't know as I have no experience welding aluminum at all. What it most likely means is they can get the material to fuse but the joint won't be structurally sound. I do know that welding 7075 is not acceptable for repair or fabrication in aviation

Ahh, okay.

Wasn't trying to nitpick, I just don't have the experience to know which was correct. Thanks for the explanation.

[MistWolf]

Ok, let me back up a bit. I need to work on my reading comprehension skills. The add states the lower is semi-auto only. My bad. In that case, it can be legally transferred. It would be a good example for duplicating, but unless it's an early receiver made of 6061, it's not a good candidate for re-welding. It also looks like it's distorted just behind the bolt release. I think it was de-milled by being crushed, not bandsawed

[MistWolf]

Ahh, okay.

Wasn't trying to nitpick, I just don't have the experience to know which was correct. Thanks for the explanation.

It wasn't nitpicking at all, it was a good question- and you're welcome

[scottryan]

That seller is a moron. Look at his feedback.

[Moltke]

Don't walk, run.

[Tzook]

I know basically nothing about the vintage side of ARs, is it actually hard enough to find correct old parts that you would even consider this?

[halfmoonclip]

Well here is a Whiskey Tango Foxtot moment; after being relisted three times, the sumbitch sold for over $500.
It's still not clear to me what it is; why would there be a need to demill a semi-auto lower, why would you want it, especially since welding it is problematic, and why in hell would you pay $500 for it?
I'm simply perplexed.
Moon