Beyond the Liberator: A 3D-Printed Plastic 9mm Semi-Auto Pistol

Profiled at Ars Technica is the (mostly) 3D-printed semi-auto pistol design from a West Virginia maker known as Derwood. The PLA-based design, which Derwood calls the Shuty MP-1, isn't quite all-plastic; like others that are roughly similar, it utilizes metal for a few parts that aren't practical in plastic. (Ars says just the barrel and springs, but it looks like metal is used for the guide rod and an internal plate, as well as for the screws that hold the whole thing together.) The core of the gun is a lower that bears a strong resemblance to an AR-15's, but the assembled gun looks to me more like a Skorpion submachine gun. Unlike Cody Wilson's single-shot Liberator pistol (mentioned here a few times before), the design files are not available for download -- at least not yet: "Not long," Derwood writes in a comment on a YouTube video of the pistol's assembly.

Comments

Re:How is this newsworthy?

[ScentCone]

we will be at the point every robber in Canada will be armed with these and the government will have little choice but to give us the right to bear any arms

Governments don't give rights, they either protect them, or they infringe upon them. What you're looking for is the Canadian government ceasing to infringe on that right.

Re:Militant Slashdot

[jafiwam]

That's a false comparison. Nobody carries around a hunting rifle to, in your own words, "stop a threat."

If you're claiming hand-guns are somehow a "soft" method of defending yourself, then you are sorely mistaken.

You should try to get out of the city occasionally.

The line between "pistol" and "rifle" is a fake one defined by the ATF where "designed to be fired with one hand" and "designed to be set to the shoulder to fire" is the definition. Caliber and ballistic capabilities are not included in the distinction. Then there are dimensions and other stuff tacked onto those definitions, firearms that fall out of those dimensions are AOWs (Any Other Weapon) or SBS or SBRs.

So it IS quite possible to be using a "pistol" that's basically a rifle with rifle-like ballistic results but with pistol legality (whatever that happens to be at that location.)

Re: Militant Slashdot

[Bob the Super Hamste]

People keep shooting up schools and other public places with automatic weapons.

I don't think anyone has used a fully automatic weapon to shoot up a school. Granted the San Bernardino shooters had a fully auto weapon (maybe 2) but that was illegally modified so it isn't like they just went down to the store and picked one up.

Such weapons are not that useful for hunting, and of somewhat dubious value for self defense

What weapons, fully auto machine guns that no one has used in a school shooting or semi automatic weapons? I assume you mean semi automatic ones which are very effective for hunting. They have been used for years. My grandfather used a semi automatic Remington 11-48 for pheasant, duck, and goose hunting for years from about 1950 until he gave up hunting in the late 70s. For years I deer hunted with a Romanian SKS as the SKS basically replaced the lever action .30-30 as the bare bones entry level deer rifle. Lots of people use to hunt with old M1 Garands that they got through the CMP and I wouldn't mind using one for deer hunting. The .223 AR15 type weapons are a very popular and effective varmint rifle for things like packs of coyotes, and prairie dogs.

I can't speak to the self defense aspect but a semi auto shotgun seems like it would be pretty good for home defense. Also I don't think may people are carrying around a long gun for self defense, most people prefer a much smaller handgun.

Re: Militant Slashdot

[ValentineMSmith]

I'm going to hope that this is just an unintentional lack of knowledge on your end. If you're actually open to reading facts, please keep reading. Otherwise, feel free to ignore this.

First, in response to the comment about people that keep "shooting up schools and other public places with automatic weapons." This is incorrect. The phrase "automatic weapon" refers to a weapon that can discharge more than one projectile due to a single action (pulling a trigger or actuating some other mechanism). As far as crimes with automatic weapons go, they are so low as to be lost in the underflow of the number of other assaults. In 1934, the National Firearms Act regulated automatic weapons, suppressors, short barreled rifles and shotguns, and "other weapons". Since that date, you have to pay a $200 tax just to be allowed to purchase the weapon. You also have to undergo a background check even more thorough than most class 3 Federal Firearms Dealers. The automatic weapon must be registered and kept at a known location at all times, and the Feds can knock on your door at any time of the day or night and demand that you produce that weapon immediately for their inspection. If you can't, it's a federal felony.

Since 1934, there have been 2 murders committed with registered automatic weapons. As far as unregistered automatic weapons go, numbers vary, but are again so low as to be statistically insignificant. According to GunCite ( http://www.guncite.com/gun_con... ), 4 police officers were killed between 1983 and 1992. And even when targeting groups that are thought to have large numbers of automatic weapons, virtually none of the firearms recovered in raids on drug houses, gangs, and so on were automatic. For all intents and purposes, automatic weapons are not used in crime.

And, since 1986 when the NFA was amended, only automatic weapons made before that date are now available for purchase by the public. This amendment ended out pricing most automatic weapons out of the reach of the standard consumer, and for those that do buy them, they're usually purchased as investments not, not with the intent to shoot them.

As far as the second half of your comment goes, I'm going to assume you're talking about so called "assault weapons", or what are more accurately termed modern sporting rifles (MSRs). And when people think of an MSR, they think generally of an AR-15 variant (go Google what the AR in AR-15 stands for. Hint: it does NOT stand for Automatic Rifle). What is so bad about them?

1: You say "their only real purpose seems to be for killing lots of people efficiently." First, the caliber of most AR-15 variants (5.56x45 NATO, or .223 Remington (and yes, the specs are not completely equivalent between those to calibers, but for the sake of argument, we'll assume they are)) is small enough (and fast enough) that the rounds tend to not do all that much damage to a man-sized target. In fact, in many states, it's illegal to hunt deer with a .223, as it's likely to only wound and not kill it. So, no, an AR-15 is not a particularly efficient killing machine. If you don't believe me on this, go find an Iraq/Afghanistan vet. If they're willing to talk to you about their experiences, ask them about how effective the M-4 was at killing the enemy. Or use Google. The stories are out there. The only reason the US Military uses 5.56x45 instead of 7.62x54 (the old .308 Springfield cartridge that got your (great)grandfather through World War II) is that you can carry 70% more 5.56 than you can 7.62 for the same weight and size of package.

2: Because the AR-15 platform is so modular, my wife and I can shoot the same rifle. My arms are a little shorter than hers. I can adjust the stock. Because it has a pistol grip, I can hold it more comfortably. If you take a look at the definition of an assault rifle from the 1994 US ban, it involved a rifle that could accept a detachable