here's a fixture for finishing 80% lowers that uses a drill to make the initial holes, and finishes the cutting with a router.
And here's a way to make a lower from scratch, bolting it together.
And some stuff on how gun control got started.
Lowers aren't high density appliances. You can make them from plywood. The hard part happens in the chamber/barrel/locking lugs of the upper. Or you can start from scratch and make your own guns from all manner of things
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