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You can buy unfinished lowers ("80% lower receivers") with no serial number, since they are not yet functional lower receivers. It's really easy to buy these, and not too difficult to finish them. Then you have a 100% off the record firearm.

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You don’t even need to buy the lower. 3D Printed lowers work just find. In addition you can also just make a mold out of sand. Melt down a bunch of aluminum cans and cast a lower.

This stuff isn’t rocket science.

A cast lower would still require a non-trivial amount of machining to get it within tolerances. Forged lowers are still machined.

I've seen people with no prior experience do it just fine. I feel like people underestimate what average humans are capable of with only meager determination.

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