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In reply to the discussion: That $1,200 Machine for Making Untraceable Guns Just Sold Out in 36 Hours [View all]NickB79
(20,370 posts)This is what it's making: https://www.stagarms.com/stripped-lower-receiver-5-56/
To build the gun, you need to add all the trigger parts, springs, screws, as well as a stock and a barrel upper assembly. They all snap together pretty easily, but the machine in the OP doesn't make those AFAIK.
At $100 for a stripped receiver, you'd REALLY need to like AR's for this machine to pay for itself.
With the rise of 3D printing, though, this was inevitable. The next step will be the creation of polymers strong enough to contain the pressures generated by a firearm, and viola! Real, plastic guns that can be built entirely in your house, from the barrel to the receiver to the magazine to the stock. Maybe you'll need a few springs and screws from the local hardware store, and ammo of course, but that's about it.
Pretty scary, honestly.