9mm 3d Bullet
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A 25-year-old machinist in Pennsylvania has figured out how to make bullets that work in a 3D-printed gun. You can make your own 3D-printed gun, but, until now, shooting it was another matter.
There's a fundamental mismatch between the typically plastic makeup of a 3D-printed object and the explosive nature of ammo. Firing bullets creates a mini explosion in the gun chamber, a force only contained and channeled forward behind the lead bullet by the average gun's metal barrel.
'I noticed that a lot of the [3D-printed] guns were unsafe, to put it mildly,' Michael Crumling, who is both interested in 3D printing and is an amateur gunsmith, told Mashable. 'One major flaw was that they were trying to use traditional ammunition in these guns.'
No one was trying to make special ammo that wouldn’t turn the 3D printed gun they were holding into an unstable grenade, he said.
There have been a few cases of 3D-printed guns firing more than one shot of real ammo, most notably the Canadian developer who claimed to have fired 14 shots before his 3D-printed rifle broke. Most other 3D-printed guns fail with real ammo during the first shot. All that heat and pressure is, it seems, too much to handle for PLA, the material typically used in 3D printing. There are 3D-printed metal guns, but they've only been printed on costly machines by actual gun manufacturers.
As others tested ammo in 3D-printed guns, Crumling, watched from the sidelines. Then a year ago, he began work on custom designing and building his own ammo for 3D-printed guns. It wasn't easy work. His first test wasn't successful.
'Part of the gun pretty much exploded,' Crumling said.
Still, when he collected the pieces, he found the shell intact and realized the design flaw was in his 3D-printed gun. That gun now has some metal bits to hold it together and a piece of metal inside to make it legal, meaning detectable by metal scanners.
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Eventually, though, Crumling figured it out. With a shell both thicker and longer than a traditional bullet, Crumling's ammo looks more like a shotgun shell than a bullet. That signature look, though, is the secret sauce. When the 3D gun's trigger is pulled and the hammer hits the back of the bullet, the gunpowder charge is ignited just as it would be in a regular gun. In this case, however, the bullet itself contains and channels the explosion, helping to protect the plastic housing of the 3D printed gun.
“The cartridges contain all of the pressure generated by the gun powder,” said Crumling, explaining why his 3D gun ammo works better than traditional bullets.
Crumling has now used his home-made ammo, which he calls .314 Atlas, to shoot 19 rounds on a PLA-based 3D printed gun. For now, the bullet is still a round lead ball, and each round is hand-made, for roughly 27 cents apiece.
Not everyone is happy about Crumling's breakthrough.
'This just shows that the technology is one step closer to being available to the general public,' said Michael McLively, staff attorney for national watchdog group the Law Center to Prevent Gun Violence.
You don't need a gun license to print a 3D gun just a 3D printer, which range in price from $400 to thousands of dollars. One of the key barriers to these DIY guns' proliferation is functionality, noted McLively.
'If you can prove they work as well as a regular gun, and you can evade the background check process, it makes it that much easier for dangerous people to get 3D printed guns,' McLively said. Contoh kertas kerja rancangan perniagaan tudung.
As Crumling notes, though, he cannot legally sell his 3D-printed ammo, telling Mashable he would need a Federal Firearms License to sell any ammo — 3D-printed-gun ready, or not.
He is, however, planning on sharing the blueprints for the bullets on his own website, something that does concern McLively who thinks it could create 'a waterfall effect,' where others build upon and perfect what Crumling was doing.
3D-printed guns that can successfully fire multiple rounds may lead to the development of 3D-printed automatics and semi-automatics, something Crumling believes is a real possibility.
'They may not look anything like traditional automatic firearms though,' he said, adding that he has no plans on creating any firearms.
McLively sees it all as a slippery slope. 'It's not hard to imagine the havoc that could create if someone prints a 3D machine gun in their garage,' he said.
For now, the bullets are still in the prototype stage. When asked about accuracy of shooting a bullet out of what is essentially a gun barrel inside another gun barrel, Crumling said he is 'not even to the point of messing with accuracy yet.'