Fenixgoon
Lifer
- Jun 30, 2003
- 33,487
- 13,137
- 136
It's going to be illegal either way. The distinction is between what would be seen as raw material and a completed unit, and casting a proper lower around a mold and not removing it does not give you an 80% lower. It'd be like saying that if you sand-cast an engine block that the block is only 80% manufactured as long as you don't knock the sand out. Just because the block didn't exist before the sand and it has never existed separate from it doesn't mean you've cast a metal ingot and not an engine block.
According to builders the material is of a different consistency than the frame, so the casting of the frame around it is going to be the manufacture of a firearm. They have the pattern of a >80% lower, they inject it with a proper material to make a lower, that's a firearm.
I mean, really:
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you still have to mill out the 20% part. it's not like you can just pull it off like the pop top on a soup can or knock the sand off a sand casting.
it's a different manufacturing process. most lowers seem to be forged (from my brief survey of the interwebs) - start with a hunk of metal, bash it into a rough shape to get proper work and grain flow, and then machine to final dimensions.
if you cast the lower as two pieces instead of forging it as one, what difference does it make? at the end of the day, you still have to perform all the same machining operations to get from 80% to the final product.
