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The only good thing is that a ar upper contains no load on firing so no safety issues involved


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A pity that this has a lot less material to tap into compared to any bolt gun I have seen, and the whole alloy thing v steel.

I'm very interested in how the op gets on


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I have seen both grub screws and cap screws. I don't think either is ideal for what it's worth-personally I would bin it and buy a new one


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Yea, my first was $5k for base rifle


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No problem

https://nzar15.com/store/parts/upper-receiver/stripped-uppers/anderson-manufacturing-lightweight-upper-receiver

I think these are the cheepest uppers in NZ right now, so you can see...

Most gunsmiths could do it, if they would is another matter as there time is probably worth more than you want to pay and if it's not perfect they risk there reputation.
$10 tap,$5 grub screws, $10...

I have only done a little alloy wielding, but wouldn't the risk of distorting such thin alloy make the cost of doing so not worth it v just buying a Anderson or aero upper? How about grub screws and...