Yeah, cuz criminals have never been able to get their hands on things they shouldn't have and people have never been able to get things once they become illegal...everyone knows that.
It's is not about safety. It's not about guns. It is all about data and money. Gathering data via smart devices is big business and nets good money for literally nothing. The in-person sales, background checks and mandatory "safety measures" ensure high prices for low production cost (because it's low quality) at a strictly local market with very limited competition (local monopoly) and a carte blanche to use the gathered date however the heck the company wants. Short: Max money for min product.
Law makers are making laws to regulate 3D printers to prevent creation of ghost guns that the metal detectors at their offices won't pickup while doing nothing to regulate the metal guns that kill hundreds of Americans every day. Yeah that sounds about right .
someone needs to make that legislator aware of the UWU Airsoft rifle
she's gonna hate it and it's going to make her uneasy, but this is what free speech and folks with adult money and a juvenile sense of humor will come up with
Guns laws are mostly stupid. I've spent a great deal of time learning the subject, and while I can hardly teach a class on Imgur, I'll just say most are ineffective or even counter productive. Yes, even the "common sense" laws many think are common sense. This is an egregious example of "dumb".
I mean the NRA makes sure any gun law that passes is stupid and ineffective. Without the huge amount of bribes from NRA(ie gun manufactures), we could have actual common sense laws that the majority of gun owners would support.
Yeah? Tell that to the fact literally every other country with proper gun laws doesn't have a rampant issue with several mass shootings a week like America does. So sorry bud but the data ain't on your side and you are talking passionate bullshit
So... they wanna restrict 3D printers because of plastic gun parts, but don't wanna restrict the actual guns? I am too european to understand this level of mindbending logic.
At this point gun control is like protecting children, an excuse for mass-surveillance without any meaningful impact on the original topic. Solving the problem would remove the excuse.
I understand the intent...but yeah, that's fucking stupid.
Also, by doing that, you're not eliminating the older models that CAN produce "Ghost Firearms".
If anything, you're just incentivizing more crime, as you're now just making the older models a commodity for the criminals to just...y'know, steal, or possibly hurt/kill people who own older 3D printers.
It's like a weird, much more stupid version of Prohibition, but now instead of Alcohol, it's nifty, ACTUALLY VALUABLE technology with a-
You know, honestly. I'm not really worried about 3d printers printing ghost guns.
I am however very worried about rich people trafficking/raping kids and feeling like they are free to break laws without facing appropriate punishment like the rest of us would.
So, maybe they should stop pretending like they are trying to solve a problem by applying ineffective bullshit laws, and actually tackle a REAL problem that they can in fact solve.
Ban the thing I dont understand so the bad bad goes away. People who think they can just click print and a gun comes out really need to educate themselves
They don't care. The gun thing is just a facade for their real intentions. This proposal has nothing to do with public safety and everything to do with data accumulation.
They know they are being facetious when they say these things. You cannot take their bullshit at face value. They aren't stupid, they are manipulative.
They are! They're making sure you have to give their friends money to get one, rather than having one for free. Can't go having something without it being paid for so they can get more rich
How about we fix our fucked up society so that people aren't driven towards violent crime in the first place? Let's actually solve the root fucking issues for once instead of bickering about which symptoms to put a bandaid on?
Yes but also gun control will save lives. Red flag laws, background checks and various other restrictions have been found, by science, to save lives, that's why civilized countries enact these policies. A violent criminal can't really kill as many people in a stabbing spree or even a vehicle murder as a mass shooter can. USA is flooded with guns, and it makes y'all less safe, and the data clearly shows this. Part of fixing the society is making it harder to acquire a gun and go on a rampage.
You want to stop people from printing guns? Pay them a living wage and they'll be too busy living a decent life, taking care of their house, playing with their kids, and taking vacations to even think about printing untraceable guns to shoot rich people (the actual criminals already have both real guns, and access to printers).
The cats already out of the bag, you can't put 3d printers back, only make life miserable for people stuck paying for your stupid law.
A: Performative nonsense - "we don't want to actually crack down on guns, but let's make it look like we're doing something adjacent to gun control and see if they buy it". B: Control - "We are telling you people you can't do a thing, just because we can."
Combine those, and you will understand what is going on.
Building unregistered guns is 'fun'??? We have WAY too many guns on the street now, and do not need guns that can pass thru xray machines, to go on planes.
APPEARING TO have good intentions. Any law that says "you can't 3-D print anything that looks sort of like any part of a gun" is not a well-intentioned law, and it will do absolutely nothing about the gun issue at large, because a vast majority of gun owners still get their guns from the big producers of such.
Imagine if someone needed to 3-D print a customized pipe for a plumbing project, but whatever AI monitors this thinks it might be a gun barrel.
So, legally speaking, you can make your own firearm at home for personal use per the ATF and Federal and State law.... (assuming it does not violate the 1934 NFA)... some states require you to get your homemade guns serialized (IL, CO, OR, CA, etc.), basically take them to a gun shop and get a SN attached.
A note that if you do so, be aware that you could just be making a pipe bomb (esp if you are grabbing a piece of pipe for your pressure bearing surfaces)
do 3d printed guns even exist? This has been a scare story since 3d printers became a thing but I don't recall ever seeing a story about somebody actually USING one.
I’m in favor of sensible laws, not getting caught up in a web of ever-expanding “let’s ban stuff because it might be used for stuff that might be used for bad stuff.”
its still easier to just go to texas and buy a real gun then learn to make one. There's no background checks for that either if you buy private or at a gun show.
Yeah I feel like the true goal is banning printing your own replacement parts. "Hey you can print a little plastic replacement latch for the product, it's patented! You have to buy it from the manufacturer!", but to do that they need all the 3d printers to be connected to the internet and all print files scanned by AI before printing.
I own a lathe and a mill, do I have the tools to make a gun? Of course... do I have the skillset? Absolutely not.
Can a 3D printer produce unlawful parts? Yep... and printing one of them is a great way to get 10 years in prison (e.g. a Glock switch). So, where is the crime line? When you bought a 3D printer? Possession of the STL file? This seems like a perfect example of 'no prior restraint' and an unconstitutional law.
I mean, you really do.... CNC just means Mach4 or some other controller is handling the tool selection and steps.... you still need to get the CNC up and running... it is not simple...
Two-Axis CNC is pretty straight-forward... add a 3rd or 4th (rotational) and the work holding becomes an art form (how do you make sure your operations don't yoink the piece off its mounts?)
modern printers for gun making can work in reinforced nylon, which is the same polymer actual firearms are made of. You can't make the bolt or the firing pin or the barrel but you can 3d print everything else, making acquiring a firearm with a (expensive, like 3000usd just in parts) correctly designed and set up printer much easier
I mean yes, but also yes.... then again, almost all modern pistols are using polymer frames to reduce weight... but those aren't on the pressure bearing surfaces and they usually have steel inserts to support the frames.
Those are usually made with glass-fiber reinforced thermoplastic Nylon... beyond the capabilities of a consumer 3D printer (note, PA6-CF filament printed via FDM is not the same as injection molding PA6 Nylon, esp on its Z-axis).
A note that Brick-Layer slicing offsets layers to dramatically improve Z-Axis strength.... however, it is still nowhere near as strong as the X-Y layers.
Sorry but statistically access to an inherently violent tool, and the banning of that tool has been proven time and time again to work against providing access to it. "people who really wanna commit a crime will just get around it" well yeah. That's what criminals do. But then if only the criminals are left, guess what buddy. It's gonna be a whole lot easier to identify their intent. No other country with guns has the issue America does. Because of STRICT CONTROL.
I’m one of the most stringently anti-gun people you’ll find but this policy is fucking stupid. At best it will be absolutely ineffectual, and at worst it will have unexpected and unintended negative consequences while STILL being completely incapable of meaningfully preventing gun crime (because it doesn’t do anything to actually reduce the number of real guns in the US).
So, making 3D replicas of guns (non-functional) is a key point of cosplay (I printed my own DL44 blaster, it looks cool... the weight is really really wrong tho)....
Exactly. The people writing these laws are so fucking naive and generally ignorant about the issues surrounding guns.
They're basically looking at this from a perspective of: all guns look roughly the same, so we can just use technology to ban everything that looks like a gun right now.
What they're missing is that 1) a gun can be made to look like anything. And 2) guns are made from a series of parts. When they aren't assembled, these parts look nothing like guns. How do you ban that?!
I think that’s simplified but not incorrect. Oh no I can only buy *checks notes* a gen 3 Glock in ca now, and it has to be in stock by July 1 or used. It’s literally the most common gun maybe ever? It’s all an issue of engineering the next fix.
Yeah have you ever seen a disassembled gun without the upper and lower reciever (or frame on a pistol or whatever)? It's literally a bunch of levers, rotors, springs and plates. You have to ban simple mechanics to ban guns this way (remember, we're talking stuff that had most of its mechanical issues 'solved' 110 years ago at latest).
I really want to know what to do with the receiver I bought in 2016. We thought they’d disappear in CA so I panic bought a lower receiver. Still haven’t built shit.
You don't even need all the levers and shit. I went to a museum in an old prison and they had guns made in prison from the late 1800s to like the 30s, you can (and people have as evidenced in said museum) make a gun by having the right sized pipe, a bullet or shell, and any old hard thingy™ to hit the primer with. Are they efficient? No. Particularly accurate? Probably not. Will they kill someone? Yeah.
Osiricus
Yeah, cuz criminals have never been able to get their hands on things they shouldn't have and people have never been able to get things once they become illegal...everyone knows that.
Waschbaerkoenig
It's is not about safety. It's not about guns.
It is all about data and money.
Gathering data via smart devices is big business and nets good money for literally nothing. The in-person sales, background checks and mandatory "safety measures" ensure high prices for low production cost (because it's low quality) at a strictly local market with very limited competition (local monopoly) and a carte blanche to use the gathered date however the heck the company wants.
Short: Max money for min product.
Procrastinator57
A digital registry for 3D printers but a paper registry for actual guns? Weird.
Cactus21
Let’s ban roads because people use them to escape crime scenes…. /s
LerryV2
Add this to the mountain of reasons not to use Bambu or any other printer that requires an internet connection.
J3lek
Law makers are making laws to regulate 3D printers to prevent creation of ghost guns that the metal detectors at their offices won't pickup while doing nothing to regulate the metal guns that kill hundreds of Americans every day. Yeah that sounds about right .
TheIronPenguin
3D Printing Nerd published a video the other day talking about this + proposed laws in other states and on federal level https://www.youtube.com/watch?v=86DCeJGNlbY
WhattaMattahYou
someone needs to make that legislator aware of the UWU Airsoft rifle
she's gonna hate it and it's going to make her uneasy, but this is what free speech and folks with adult money and a juvenile sense of humor will come up with
as is THEIR CONSTITUTIONAL FUCKING RIGHT
WhattaMattahYou
the aforementioned UWU rifle https://www.youtube.com/watch?v=3I5_M2uziyo
CaldariBob
Instead of the printed parts, crack down on things like barrels and receivers (I'm assuming there's no 3D print that replaces the stressed parts)?
FoxPesdassi
Meanwhile, those same lawmakers go up in arms if anyone tries to restrict or limit sales of ACTUAL GUNS.
shalafi71
Guns laws are mostly stupid. I've spent a great deal of time learning the subject, and while I can hardly teach a class on Imgur, I'll just say most are ineffective or even counter productive. Yes, even the "common sense" laws many think are common sense. This is an egregious example of "dumb".
martineb72
I mean the NRA makes sure any gun law that passes is stupid and ineffective. Without the huge amount of bribes from NRA(ie gun manufactures), we could have actual common sense laws that the majority of gun owners would support.
SquiddelyDooDoodlyDoo
Yeah? Tell that to the fact literally every other country with proper gun laws doesn't have a rampant issue with several mass shootings a week like America does. So sorry bud but the data ain't on your side and you are talking passionate bullshit
paynoattentiontousernames
So... they wanna restrict 3D printers because of plastic gun parts, but don't wanna restrict the actual guns? I am too european to understand this level of mindbending logic.
ImFunAtFunerals
At this point gun control is like protecting children, an excuse for mass-surveillance without any meaningful impact on the original topic. Solving the problem would remove the excuse.
NoodlesDOTExe
I understand the intent...but yeah, that's fucking stupid.
Also, by doing that, you're not eliminating the older models that CAN produce "Ghost Firearms".
If anything, you're just incentivizing more crime, as you're now just making the older models a commodity for the criminals to just...y'know, steal, or possibly hurt/kill people who own older 3D printers.
It's like a weird, much more stupid version of Prohibition, but now instead of Alcohol, it's nifty, ACTUALLY VALUABLE technology with a-
NoodlesDOTExe
-million different usages...just happens that one usage was for nefarious purposes.
TheDoctorCrankenstein
Burn the whole fucking system down. I'm fucking tired of this society.
GanjalfTheGray
You know, honestly. I'm not really worried about 3d printers printing ghost guns.
I am however very worried about rich people trafficking/raping kids and feeling like they are free to break laws without facing appropriate punishment like the rest of us would.
So, maybe they should stop pretending like they are trying to solve a problem by applying ineffective bullshit laws, and actually tackle a REAL problem that they can in fact solve.
ottercontrol
Whats a ghost gun? Do you mean an unserialized firearm?
PantlessThunderGoose42
Yes, guns that can’t be traced
TuckerCarlsonWarnedYouTheredBeGirlsLikeMe
long arms with serial numbers can't really be traced either.
LerryV2
Ban the thing I dont understand so the bad bad goes away. People who think they can just click print and a gun comes out really need to educate themselves
TheDoctorCrankenstein
They don't care. The gun thing is just a facade for their real intentions. This proposal has nothing to do with public safety and everything to do with data accumulation.
They know they are being facetious when they say these things. You cannot take their bullshit at face value. They aren't stupid, they are manipulative.
LerryV2
Of course not. Its always about take take take
TheDoctorCrankenstein
Kimmykix
Glad I live in Europe, the land of the free :)
Fishy820
Never thought I would hear those words and think I'm jealous because I'm in the U.nited S.hithole.
TheMellowPeril
I’d say the same about my country, Canada, but the reality is that the fumes from the meth lab downstairs always find their way up into our apartment.
WickedSludge
HOW ABOUT WE FOCUS ON THE REAL, ACTUAL FUCKING GUNS YOU STUPID CUNT!? GOD!
TheWhiteBarry
It's not either or. It's both.
TheBlueMuppet
They are! They're making sure you have to give their friends money to get one, rather than having one for free. Can't go having something without it being paid for so they can get more rich
TheDoctorCrankenstein
How about we fix our fucked up society so that people aren't driven towards violent crime in the first place? Let's actually solve the root fucking issues for once instead of bickering about which symptoms to put a bandaid on?
Rhythmaster
Yes but also gun control will save lives. Red flag laws, background checks and various other restrictions have been found, by science, to save lives, that's why civilized countries enact these policies. A violent criminal can't really kill as many people in a stabbing spree or even a vehicle murder as a mass shooter can. USA is flooded with guns, and it makes y'all less safe, and the data clearly shows this. Part of fixing the society is making it harder to acquire a gun and go on a rampage.
WickedSludge
And we can and should address the issue from both angles. Fixing the underlying issues and also getting guns off our streets.
Poppypoppoppop
What's actually "crazy" is the length US lawmakers go to to ban anything else than real guns. F-ing LMAO
StillScreamingIntoTheVoid
You want to stop people from printing guns? Pay them a living wage and they'll be too busy living a decent life, taking care of their house, playing with their kids, and taking vacations to even think about printing untraceable guns to shoot rich people (the actual criminals already have both real guns, and access to printers).
The cats already out of the bag, you can't put 3d printers back, only make life miserable for people stuck paying for your stupid law.
CedricDur
So, wait wait wait, no gun control laws, but 3d printer laws??
catherinecc
Every NICS check adds to a secret federal gun registry, 3D printed guns don't. A handful dead at a school 3 times a week doesn't threaten the state.
DukeDarkwood
A: Performative nonsense - "we don't want to actually crack down on guns, but let's make it look like we're doing something adjacent to gun control and see if they buy it".
B: Control - "We are telling you people you can't do a thing, just because we can."
Combine those, and you will understand what is going on.
CedricDur
Reminds me of the new law to 'forbid strippers in schools' :D
urusername2
Building unregistered guns is 'fun'??? We have WAY too many guns on the street now, and do not need guns that can pass thru xray machines, to go on planes.
stayingalive4life
This, while maybe having good intentions, is a very bad idea. It sets precedence and can be twisted by other people to fit their agenda in the future.
DukeDarkwood
APPEARING TO have good intentions. Any law that says "you can't 3-D print anything that looks sort of like any part of a gun" is not a well-intentioned law, and it will do absolutely nothing about the gun issue at large, because a vast majority of gun owners still get their guns from the big producers of such.
Imagine if someone needed to 3-D print a customized pipe for a plumbing project, but whatever AI monitors this thinks it might be a gun barrel.
OhIfIMust
The road to Hell is paved with good intentions.
bippityboppitybuttsex
So, legally speaking, you can make your own firearm at home for personal use per the ATF and Federal and State law.... (assuming it does not violate the 1934 NFA)... some states require you to get your homemade guns serialized (IL, CO, OR, CA, etc.), basically take them to a gun shop and get a SN attached.
A note that if you do so, be aware that you could just be making a pipe bomb (esp if you are grabbing a piece of pipe for your pressure bearing surfaces)
SmashySashimi
Politicians: "GUNS aren't the problem, everything SURROUNDING guns are the problem..."
CarlBassett
thepeenisbehindthetrenchcoat
I'd be making a 3D printed R2D2 fleshlight as my first project.
bippityboppitybuttsex
TPU FTW!
darthstormer
DukeDarkwood
Compromise: R2-D2 scream.
stayingalive4life
I see you and raise you a Hellraiser.
TeelMoobeel
Slannesh is down for this.
thepeenisbehindthetrenchcoat
Ow, fuck yeah!
InfocalypseRising
do 3d printed guns even exist? This has been a scare story since 3d printers became a thing but I don't recall ever seeing a story about somebody actually USING one.
CedricDur
From what little I know they aren't good for many shots, but between one to three they work.
Wolfshead009
And if you do it wrong, you get a grenade in your hand.
gardengnomeii
Whomever shot the healthcare ceo last year used a gun that was '3d printed'.
ImFunAtFunerals
Yes.
https://pmc.ncbi.nlm.nih.gov/articles/PMC10998078/
OhIfIMust
Oh, the pearl-clutching virtue signaling!
I’m in favor of sensible laws, not getting caught up in a web of ever-expanding “let’s ban stuff because it might be used for stuff that might be used for bad stuff.”
AtmaDarkwolf
Isn't she the same one who called something 'A one learning' ? (AI)
OneMoreLime
Industry writes the laws. It's no accident the "safety" concerns will be satisfied by Ai.
mytruepersonality
its still easier to just go to texas and buy a real gun then learn to make one. There's no background checks for that either if you buy private or at a gun show.
DropDrop
Yeah I feel like the true goal is banning printing your own replacement parts. "Hey you can print a little plastic replacement latch for the product, it's patented! You have to buy it from the manufacturer!", but to do that they need all the 3d printers to be connected to the internet and all print files scanned by AI before printing.
iamthemurray
I agree, this is just first step to test the waters on how much overreach they can get away with. 3D printers of all things though.. https://media4.giphy.com/media/v1.Y2lkPWE1NzM3M2U1MnplejNqdjkwbGttdDQ4OXJvZXd1MWQ1eGx6Nmp2bXZpYnRta20yNiZlcD12MV9naWZzX3NlYXJjaCZjdD1n/ukGm72ZLZvYfS/200w.webp
OhIfIMust
That hadn’t occurred to me, but considering how blatantly-bought so many politicians are, I wouldn’t be at all surprised if that’s the case.
I fucking hate this.
bippityboppitybuttsex
Yeah, this is dumb as fuck.
I own a lathe and a mill, do I have the tools to make a gun? Of course... do I have the skillset? Absolutely not.
Can a 3D printer produce unlawful parts? Yep... and printing one of them is a great way to get 10 years in prison (e.g. a Glock switch). So, where is the crime line? When you bought a 3D printer? Possession of the STL file? This seems like a perfect example of 'no prior restraint' and an unconstitutional law.
AntaNce
This is what we used to call 'unenforceable'. Costs money too, & creates a bureau to be funded. And will not accomplish anything of value.
PanNonOpticon
With a CNC you don't need the skillset, just a file and instrustions to follow.
bippityboppitybuttsex
I mean, you really do.... CNC just means Mach4 or some other controller is handling the tool selection and steps.... you still need to get the CNC up and running... it is not simple...
Two-Axis CNC is pretty straight-forward... add a 3rd or 4th (rotational) and the work holding becomes an art form (how do you make sure your operations don't yoink the piece off its mounts?)
PanNonOpticon
That is just a question of what kind of a gun. You can design a gun that is doable without rotations.
TheMellowPeril
Last I heard, plastic guns are generally shit anyway
blaghart
modern printers for gun making can work in reinforced nylon, which is the same polymer actual firearms are made of. You can't make the bolt or the firing pin or the barrel but you can 3d print everything else, making acquiring a firearm with a (expensive, like 3000usd just in parts) correctly designed and set up printer much easier
bippityboppitybuttsex
Z axis weakness will keep your layers fragile.... You will be strong in x and y, but z will kill it
bippityboppitybuttsex
I mean yes, but also yes.... then again, almost all modern pistols are using polymer frames to reduce weight... but those aren't on the pressure bearing surfaces and they usually have steel inserts to support the frames.
Those are usually made with glass-fiber reinforced thermoplastic Nylon... beyond the capabilities of a consumer 3D printer (note, PA6-CF filament printed via FDM is not the same as injection molding PA6 Nylon, esp on its Z-axis).
bippityboppitybuttsex
A note that Brick-Layer slicing offsets layers to dramatically improve Z-Axis strength.... however, it is still nowhere near as strong as the X-Y layers.
darthstormer
And the only thing this will accomplish, is making people get creative and designing gun parts that don't look like gun parts.
Oh, and push inexpensive models out of the market and further normalize having every device you own report back to the government.
maincarrot
It's not a gun! .... It's a scaffold!
SquiddelyDooDoodlyDoo
Sorry but statistically access to an inherently violent tool, and the banning of that tool has been proven time and time again to work against providing access to it. "people who really wanna commit a crime will just get around it" well yeah. That's what criminals do. But then if only the criminals are left, guess what buddy. It's gonna be a whole lot easier to identify their intent. No other country with guns has the issue America does. Because of STRICT CONTROL.
Septcanmat
I’m one of the most stringently anti-gun people you’ll find but this policy is fucking stupid. At best it will be absolutely ineffectual, and at worst it will have unexpected and unintended negative consequences while STILL being completely incapable of meaningfully preventing gun crime (because it doesn’t do anything to actually reduce the number of real guns in the US).
bippityboppitybuttsex
So, making 3D replicas of guns (non-functional) is a key point of cosplay (I printed my own DL44 blaster, it looks cool... the weight is really really wrong tho)....
This law bans that too.
DanielAsparagus
PRE CRIME! GET THE PRECOG OUT OF THE BATHTUB!
GanjalfTheGray
Exactly. The people writing these laws are so fucking naive and generally ignorant about the issues surrounding guns.
They're basically looking at this from a perspective of: all guns look roughly the same, so we can just use technology to ban everything that looks like a gun right now.
What they're missing is that 1) a gun can be made to look like anything. And 2) guns are made from a series of parts. When they aren't assembled, these parts look nothing like guns. How do you ban that?!
DanielAsparagus
I think that’s simplified but not incorrect. Oh no I can only buy *checks notes* a gen 3 Glock in ca now, and it has to be in stock by July 1 or used. It’s literally the most common gun maybe ever? It’s all an issue of engineering the next fix.
1stDrunkJoe
This is a classic case of, "Somebody's wealthy campaign donor had a great idea."
agonarch
Yeah have you ever seen a disassembled gun without the upper and lower reciever (or frame on a pistol or whatever)? It's literally a bunch of levers, rotors, springs and plates. You have to ban simple mechanics to ban guns this way (remember, we're talking stuff that had most of its mechanical issues 'solved' 110 years ago at latest).
DanielAsparagus
I really want to know what to do with the receiver I bought in 2016. We thought they’d disappear in CA so I panic bought a lower receiver. Still haven’t built shit.
GanjalfTheGray
Why not give it a go then? Even if you didn't want to do a full build, you can buy a complete upper receiver that's 100% ready to go right now.
Point is, if you have the means to do so, right now would be the time to prioritize finishing that build. Shits getting pretty dicey around here.
DanielAsparagus
Yeah that’s why I got it. Occurred to me that I shouldn’t wait for space aliens. Looking at a Daniel defense m4a1 socom upper.
Sonicschilidogs
You don't even need all the levers and shit. I went to a museum in an old prison and they had guns made in prison from the late 1800s to like the 30s, you can (and people have as evidenced in said museum) make a gun by having the right sized pipe, a bullet or shell, and any old hard thingy™ to hit the primer with. Are they efficient? No. Particularly accurate? Probably not. Will they kill someone? Yeah.
agonarch
Range and multiple shots are a big deal though, zip guns tend to have pretty poor range (though low range fixes the accuracy problem!)