https://www.youtube.com/watch?v=c_oduKvZots
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It's done the same way today, only they have monkeys in there instead of humans.
I remember reading on one of the American forums someone asked something along the lines of
"Hey, Ruger mini-14 actions sure seem pretty rough, anyone know whether they're milled, or forged?"
the first reply was:
"Neither, they just fall out of Bill Ruger's asshole"