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3D-printed gun parts last six shots in live-fire test
12-07-2012, 10:11 PM,
3D-printed gun parts last six shots in live-fire test
Quote:Earlier this year, amateur gunsmiths got together to see if they could print out some parts that could be used to construct a fully functional AR-15 semi-automatic rifle. Last weekend, a 3D-printed lower receiver was tested to failure shooting real bullets, and made it through six shots before suffering what you could legitimately call a catastrophic structural failure.

Note that this is a test of a 3D-printed lower receiver only; all of the other parts on the gun are actual gun parts, most of which are made of metal and designed to handle with the 50,000 psi stresses that come with firing a bullet. The receiver, however, doesn't have to deal with any of that, which is why these guys are testing the part to failure themselves and not clamping it to a bench instead:

Due to the fact that all the dangerous stresses are contained in the bolt and barrel extension — in the event of a lower failure, the only damage the operator faces is to the ego. The spring and buffer simply popped out the the tube and fell to the ground. The buffer detent and spring very lightly jammed the bolt halfway between open and in battery. It was easily cleared and no damage was sustained by the detent, spring, or bolt.
The hope was that they'd get 20 shots out of the gun, but they only managed six. Here's the video:

The great thing about 3D printing, though, is that these guys can now go back and say, "okay, how to we modify our design to reinforce the area that failed to be able to handle more stress?" They've already got ideas, like adding thickness or additional supporting material, and it's relatively easy to just print out a second iteration to evaluate. It's like taking a complex industrial design process and making it accessible (nearly) to the individual consumer. People may not approve of these techniques being used to build a better gun, but this is the future of making all sorts of stuff, and there's no looking back.
12-07-2012, 10:21 PM,
RE: 3D-printed gun parts last six shots in live-fire test
Gun "printing" is a good proof-of-concept, but still a long, long way off. I was amusing to see all the anti-gun nuts wetting their pants about the idea when it first came out.

Lower receivers are only $99 each right now. I have a few stashed away, but they have a government paper trail.

It's actually not difficult to machine your own lower receiver. Lots of people make them right now in garage workshops. No serial number. No government paper. Totally legal.

The barrel is the hard part.
12-08-2012, 11:12 AM, (This post was last modified: 12-08-2012, 11:14 AM by rsol.)
RE: 3D-printed gun parts last six shots in live-fire test
The age of the untraceable gun in upon us. Make pistol, fire pistol, put pistol on fire. The perfect murder weapon...
12-08-2012, 12:24 PM,
RE: 3D-printed gun parts last six shots in live-fire test
In this day and age, the pistol is nothing.

The ownership of firearms is a false sense of security.

If the populous banded together against the few, guns wouldn't be needed, but with guns, vs. an army, we would need the populous to come together; therefore, they are unnecessary.

Now, in the terms of personal and family protection, they are very effective.

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