Now, a firearms enthusiast is claiming to have added yet another thing to the list: a functional AR-15 rifle, which he made at home using a 3-D printer and gun blueprints downloaded from the Internet.
Last month, Extreme Tech reported that amateur gunsmith Michael Guslick had managed to "construct and shoot a pistol partly made out of plastic, 3-D printed parts."
Guslick, an engineer who operates under the moniker 'HaveBlue,' had previously announced in an online forum that he had successfully fired 200 rounds from his custom-made, 3-D printed .22 caliber pistol. The pistol was partially made out of plastic, having been created from a 3-D printed lower receiver and a commercial upper receiver.
In other words, the main body of the gun was made of plastic and printed at home. Guslick told The Huffington Post that he had obtained gun blueprints from a website before using his 3-D printer to print the component. To complete the weapon, he then combined it with off-the-shelf metal parts.
Guslick said that the resulting gun was a success.
"Everything ran just as it should, magazine after magazine,” Guslick described in a blog post. “To be honest, it was acting more reliably than a number of other .22 pistols I’ve shot.”
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The 3-D printed AR-15 lower receiver and an earlier 75 percent scale version, which Guslick said he printed as an initial feasibility test
Guslick said he then adapted what he had created to make an AR-15 -- a semiautomatic rifle.
Guslick said that creating his own rifle -- which incidentally was the same model used by alleged Aurora gunman James Holmes -- “wasn’t that difficult.”
The 3-D printed lower receiver assembled into a functioning .22 caliber pistol
However, Guslick said that though early testing of the rifle proved that it worked, it still had some minor feed and extraction problems that needed to be sorted out, Popsci notes.
Though various news sources have reported that the gun enthusiast's homemade weapon is the "world’s first 3-D printed gun," Guslick was quick to point out that this is not the case.
"Firearms manufacturers have been doing exactly that for prototyping and testing for many years, and I'm certain many hobbyists have used 3-D printed gun parts as well," he told HuffPost.
However, he added that his gun is -- to the best of his knowledge -- the "first 3-D printed firearm to actually be tested" in a non-commercial setting.
News of Guslick's creation has provoked a number of discussions about gun control laws and the future of gun use and manufacturing in this country and elsewhere -- with some commenters saying that 3-D printers could now allow just about anyone to assemble a completed gun from mail-order parts without government licensing or registration.
Others have pointed out that Guslick only used a 3-D printer to create one component of the rifle and that an all-plastic, functioning assault weapon is probably not in our near future.
For his part, Guslick said he's been surprised by all the media attention and insists that the creation of a 3-D printed firearm is not cause for alarm.
"In the end, 3-D printing an AR-15 lower receiver and assembling it into a functional gun is unremarkable on a technical level, yet a curious novelty on a legal level," he said.
"[And] yes, though such tools are equally available to criminals as well, I cannot foresee criminals turning to 3-D printing as an avenue to obtain illicit arms when the black market continues to serve as a far simpler means of acquisition -- and does not require any level of technical acumen."
Ultimately, Guslick said he hopes his 3-D printed creation does not take away from the many possibilities that 3-D printing has for our future.
"3-D printing will change our perception of mass production, with products being made more economically, not to mention locally. Similarly, 3-D printing will expand to help redefine ergonomics as more of the items we use everyday will not just be designed for 'humans' but for 'individuals,'" he said.
A Human Kidney
<a href="http://" target="_hplink">Last March</a>, surgeon Anthony Atala presented the results of his experiments with a 3D printer that uses livings cells to create a transplantable kidney <a href="http://blog.ted.com/2011/03/07/printing-a-human-kidney-anthony-atala-on-ted-com/" target="_hplink">at TED2011</a>.
A Grain Of Sand-Sized Racing Car Model
These super small racing car models are about as small as a grain of sand and were <a href="http://www.huffingtonpost.co.uk/2012/03/13/revolutionary-3d-printer-models-vienna_n_1341335.html" target="_hplink">created by researchers at the Vienna University of Technology</a> using an extremely fast 3D printing machine. Watch the video above to see the printer at work.
A Model Of Stephen Colbert's Head
MakerBot Industries <a href="http://www.huffingtonpost.com/2011/08/18/makerbot-stephen-colberts-head-space_n_930468.html" target="_hplink">had a little fun with their 3D printers</a> by creating a 3D model of Stephen Colbert's head and launching it into space using a weather balloon.
A Working Car Called The Urbee
<a href="http://www.dailymail.co.uk/sciencetech/article-2041106/Urbee-The-worlds-printed-car-rolling-3D-printing-presses-.html" target="_hplink">Back in September 2011</a>, the world's first 3D-printed car, the "Urbee," was constructed layer upon layer using a special 3D printer. <a href="http://www.dailymail.co.uk/sciencetech/article-2041106/Urbee-The-worlds-printed-car-rolling-3D-printing-presses-.html" target="_hplink">According to the Daily Mail</a>, the car took 15 years to make, has three wheels, and features a petrol and electric hybrid engine.
<a href="http://www.forbes.com/sites/tjmccue/2012/04/02/3d-printed-guitar-takes-instrument-design-to-new-level/" target="_hplink">According to Forbes</a>, Derek Manson of <a href="http://www.61.co.nz/" target="_hplink">One.61</a>, a New Zealand product development firm, is the mind behind the creation of these awesome-looking 3D-printed electric guitars.