Building a Sheet Metal Pistol

Floating around the Internet are plans for a semi-automatic pistol constructed out of sheet metal. Like so many plans for 3D printed guns, it appears no one has actually built one of these pistols. It exists only as a technological construct, with diagrams you can photocopy, trace onto a few bits of metal, and presumably assemble into a gun. The only proof these parts can be turned into a gun-shaped object are a few random blog posts from two years ago showing a very ugly pistol spray painted matte black.

[Clinton Westwood] decided to take up the challenge of turning these plans into a real, working gun. He’s documented his efforts on YouTube and put a bunch of pictures up of the entire build process. The gun doesn’t work quite yet, but it almost does, and he’s doing this entirely in a garage shop, with tools anyone can pick up from Home Depot.

Most of the construction of this gun is simple enough – it’s just sheet metal, after all. The magazine was constructed by tracing the pattern onto a piece of metal, wrapping it around a mandrel, and welding it together. The side plates of the gun, again, were created with a jigsaw. Rifling the barrel – the thing that makes this gun both accurate and legal – required the construction of a few interesting tools. The rifling tool is just a piece of round bar that fits through the barrel. A small piece of a hacksaw blade was cut to fit inside this round bar, and the barrel was cut very slowly with a shop-built tool.

The finished result is something that looks like it came from the finest post-apocalyptic craftsman. A gun that looks cool is useless if it doesn’t work, and here the DIY pistol falls short. The spent casings don’t eject. It’s still a step up from the first build of this gun that was only rumored to fire blanks.

Recently, the world of gunsmithing has been inundated with 3D printed pistols that don’t work, and 3D printed guns that do work, but are somehow 200 years behind the state of the art. We’re happy to see some people are still building things with their hands, and hope [Clinton] can eventually get this gun to work.

Continue reading “Building a Sheet Metal Pistol”

Building A Better 3D Printed Gun

Back in 2013, [Cody Wilson] of Defense Distributed designed and built the world’s first completely 3D printed pistol. He called his gun the Liberator, after a World War II-era single-shot pistol designed to be cheap and easy to manufacture, easy to conceal, and for members of the French Resistance, ‘a great gun to obtain a better gun’.

cyl[Cody]’s Liberator turned out to be a great gun to obtain two or three fewer fingers. Not only was this a single-shot pistol, it was a single barrel pistol; with each round fired requiring a new 3D printed barrel. Tests were carried out, explosions happened, and we couldn’t even get the thing to print. For all the media hubbub, for all the concerned legislators, the first 3D printed pistol was much ado about nothing.

3D printers are still an extremely interesting technology, and if history has proved one thing, it’s that engineers and tinkerers will keep building guns. Last week, [James Patrick] released his latest design for a working 3D printed gun. It still fires the .22lr of the Liberator, but this is a double action revolver, it won’t blow up, and if you drop it, it won’t discharge. It’s the little things that count.

[James]’ revolver is either a 6 or 8-shot revolver uses a pepper-box design, where the gun has multiple chambers and barrels in one gigantic cylinder. The double action design first rotates the cylinder to the next chamber, pulls back a striker loaded up with a firing pin nail, and (hopefully) fires a round. In the video below, [James] goes over the design of his action, and ends up showing off a few test firings of his newly designed gun.

What’s very interesting about this build is how closely the development of 3D printed firearms is following the development of historical firearms. First, we had guns that probably shouldn’t be fired, ever. Now, the technology for 3D printed guns is about up to 1830 or thereabouts. Give it a few more years and we’ll be up to 1911.


Disclaimer: if you live in the US and think this sort of thing should be illegal, contact your state representative and tell them you support a constitutional convention to remove the personal right to own and operate firearms. This right has been upheld many, many times by the judiciary, and a constitutional convention is the only way your wishes could be carried out. Your state representative probably doesn’t read Hackaday; there is no need to comment here. Let’s talk about engineering and technology instead.

Continue reading “Building A Better 3D Printed Gun”

No, Mounting A Gun To A Quadcopter (Probably) Isn’t Illegal

Earlier this month, [Austin Haghwout] posted a video on YouTube of a remote controlled quadcopter armed with a semiautomatic handgun. While there are no details of this build, it’s safe to say any reasonably sized quadcopter could be armed in such a manner; just strap a pistol to the frame, add a servo, and connect the servo to the RC receiver. We don’t think this is the first time it’s been done, but has garnered the most attention.

There is nothing novel about mounting a handgun to a quadcopter. Anyone with any experience with RC flying could replicate this build, and the only interesting part of watching a video of a quad firing a gun is seeing how the flight controller reacts to the recoil. However, in the pursuit of the exploitation of a fear of technology, this video has gone viral.

The Verge calls it, ‘totally illegal’, while The Christian Science Monitor asks how it is legal. Wired posits it is, ‘most likely illegal,’ while CNET suggests, ‘surely this isn’t legal.’ In a rare break from reality, YouTube commentors have demonstrated a larger vocabulary than normal, calling the build, ‘felonious.’

With so many calling this build illegal, there should be someone who could point out the laws or regulation [Austin Haghwout] is violating. This information is surprisingly absent. In a Newsweek post, a representative from the Bureau of Alcohol, Tobacco, Firearms, and Explosives is quoted as saying:

“ATF has reviewed the video with local law enforcement and other federal agencies. It does not appear that the device violates any existing firearms regulations…”

The Associated Press reports no state laws were broken by [Austin]. With the BAFTE and Connecticut State Police both signing off on this build, the issue of jurisdiction becomes more pronounced. How, exactly, is a gun mounted on a quad illegal?

The answer, as with all things involving quadcopters, comes from the FAA. We could find no regulations explicitly banning handguns on remote controlled quadcopters, but of all stories and posts on [Austin]’s handiwork, this is the closest anyone has come to providing the framework for calling this build illegal:

No pilot in command of a civil aircraft may allow any object to be dropped from that aircraft in flight that creates a hazard to persons or property. However, this section does not prohibit the dropping of any object if reasonable precautions are taken to avoid injury or damage to persons or property.

-FAR Part 91 Sec. 91.15

That’s it. The closest anyone has come to providing a reason why a semiauto quadcopter is illegal: because the cartridge (and bullet), are ‘dropped’ from a quad. The Feds charging [Austin] with “dropping” a bullet from a quadcopter is like taking down [Al Capone] for Income Tax Evasion. The difference being that [Al] was a notorious criminal who had obviously harmed a large swath of people and [Austin] doesn’t seem to be harming anyone.

Although [Austin]’s video of a gun toting quad is only fourteen seconds long, a few reasonable assumptions can be made about his small experiment in flying firepower. The video shows the quad hovering a few feet above the ground. This is surely allowed by the recently published safety guidelines for sUAS users. The gun itself appears to be firing into an offscreen hillside – a sensible precaution. If the only justification for the FAA’s investigation of [Austin]’s video is FAR 91.15, he’s on easy street.

Fully-Automatic CD Launcher Looks Dangerously Fun

When [JZSlenker] was challenged to find a creative way to destroy a bunch of compact discs that were burned incorrectly, he did not disappoint. He came up with a rather simple but fun contraption that launches the CD’s at high speeds and with a fast rate of fire. He doesn’t share many details about how this machine was built, but the 18 second video makes it pretty obvious how it works.

The CD gun is built mainly from a piece of plywood. This provides a flat base with which to mount the other components. A stack of compact discs is held in place by what appears to be a metal cage that was welded together. An inexpensive angle grinder is used as the propulsion mechanism. The grinding wheel is mounted just in front of the stack of CD’s in a vertical orientation. The wheel must be placed just high enough above the plywood base for a CD to fit in between the wheel and the base. This design is remarkably similar to the Sticker Gun which our own [Brian Benchoff] is building.

Some type of linear actuator is used as the firing mechanism. The actuator is hooked up to a thin piece of metal, cut into an L shape. It almost looks like a reaper tool. When a button is pressed, the actuator fires instantly. This pushes the metal hammer into the CD on the bottom of the stack. The CD is pressed forward into the grinder wheel which then shoots the CD into the air. Based on the below video, it looks like [JZSlenker] is able to fire at a rate of about three CD’s per second with this rig.

This has got to be a super-villain weapon for an upcoming movie, right? Maybe AOL-man?

Continue reading “Fully-Automatic CD Launcher Looks Dangerously Fun”

Motion Sensing Water Gun Tweets Photos To Embarrass Enemies

[Ashish] is bringing office warfare to the next level with a motion sensing water gun. Not only does this water gun automatically fire when it detects motion, but it also takes a photo of the victim and publishes it on Twitter.

This hack began with the watergun. [Ashish] used a Super Soaker Thunderstorm motorized water gun. He pulled the case apart and cut one of the battery wires. he then lengthened the exposed ends and ran them out of the gun to his control circuit. He also placed a protection diode to help prevent any reverse EMF from damaging his more sensitive electronics. The new control wires run to a MOSFET on a bread board.

[Ashish] is using a Lightblue Bean board as a microcontroller. The Bean is Arduino compatible and can be programmed via low energy Bluetooth. The Bean uses an external PIR sensor to detect motion in the room. When it senses the motion, it activates the MOSFET which then turns on the water gun.

[Ashish] decided to use Node-RED and Python to link the Bean to a Twitter account. The system runs on a computer and monitor’s the Bean’s serial output. If it detects the proper command, it launches a Python script which takes a photo using a webcam. A second script will upload that photo to a Twitter account. The Node-RED server can also monitor the Twitter account for incoming direct messages. If it detects a message with the correct password, it can use the rest of the message as a command to enable or disable the gun.

Mad Max Inspired Flamethrower Ukulele

The new Mad Max movie is getting a lot of buzz, and a few people are calling it a modern classic. There’s a flamethrower guitar in the movie, which means it’s time for cosplay accouterments. Our ‘ol buddy [Caleb] loves flamethrowers and poofers, so hacking together a Doof Warrior inspired flamethrowing ukulele was natural for him.

The fuel for this uke is a can of butane actuated with a caulking gun. This setup is actually pretty clever; by removing the locking tab on the caulking gun, butane is released when the gun’s trigger is squeezed, but stops when the trigger is released. The igniter is a simple grill igniter is used to light the gas.

[Caleb] is rather famous for his flamethrowing creations. His life-size fire-breathing piranha plant uses a similar setup to shoot fire.

Video below.

Continue reading “Mad Max Inspired Flamethrower Ukulele”

Pneumatic Pen Gun is Fit for James Bond

The James Bond franchise is well-known for many things, but perhaps most important to us hackers are the gadgets. Bond always had an awesome gadget that somehow was exactly the thing he needed to get out of a jam. [hw97karbine’s] latest project would fit right into an old Bond flick. He’s managed to build a single-shot pellet gun that looks like a pen.

[hw97karbine] started out by cutting the body from a tube of carbon fiber. He used a hacksaw to do the cutting, and then cleaned up the edges on a lathe. A barrel was cut from a piece of brass tubing with a smaller diameter. These two tubes will eventually sit one inside of the other. A custom front end cap was machined from brass. One end is ribbed and glued into the carbon fiber tube. The barrel is also glued to this end of the front cap, though it’s glued to the inside of the cap. The other end of the cap has 1/8″ BSP threads cut into it in order to allow for attachments.

A rear end cap is machined from Delrin. This piece also has a Delrin piston placed inside. The piston has a small piece of rubber used as a gasket. This piston valve is what allows the gun to operate. The rear cap gets glued into place and attached to a Schrader valve, removed from an automotive tire valve stem.

To pressurize the system, a bicycle pump is attached to the Schrader valve. This pushes the piston up against the barrel, preventing any of the air from escaping. The piston doesn’t make a perfect seal, so air leaks around it and pressurizes the carbon fiber tube. The Schrader valve prevents the air from leaking out of the pen body. A special machined button was threaded onto the Schrader valve. When the button is pressed, the air escapes; the sudden pressure imbalance causes the piston to shoot backwards, opening up a path for the air to escape through the barrel. This escaping air launches the projectile. The whole process is explained better with an animation.

Now, the question left in our mind: is this the same pressure imbalance concept that was used in that vacuum pressure bazooka we saw a couple years back?

Continue reading “Pneumatic Pen Gun is Fit for James Bond”