Introduction: BB Machine Gun(NOT AIRSOFT!!!!!)

Picture of BB Machine Gun(NOT AIRSOFT!!!!!)

This BB machine gun is powered by an air compressor and can shoot about 500 BB's in a couple of min. Fairly accurate and has a range of about 200 feet!!! Slices, dices, and rips em' new ones!

Step 1: The Parts

Picture of The Parts

First off, this is not an easy build, it takes patience and craftsmanship to get it all together.

The parts I used on this gun are pvc pipes (rated at least 400 PSI!)Including the pvc drain trap and all reducers/splicers.

All of the brass fittings need to be npt(national pipe thread)I used 3/4".

As for the stock and the barrel, the came off an old pump action bb gun, but those were just to make it cooler.

The trigger is a blow gun, and the laser sight is optional.

The most important part of this is the VORTEC BLOCK, which itself takes some time to make.

Step 2: Vortex Block

Picture of Vortex Block

The basic theory of operation of the gun uses a vortex block that when air pressure is applied it spins the bbs around very fast untill one of them lines up with the barrel and flies out of the gun.

The link below describes in detail how to construct a vortex block, its kind of like a powerball machine on crack.

vortex block

Step 3: The Gun

Picture of The Gun

With this gun you can make your own design or copy mine.

Cut all of your pvc out and dry fit before gluing together with pvc cement.
The butt of the gun is attached with a long bolt with rubber washers inside of the drain to prevent air leaks. And a bondo spacer to match the parts shapes together.

I attached the blow gun using plumbers tape.

I will be adding to the actual construction process soon!


kelms1 (author)2015-07-09

The ones in the Civil War I believe was steam powered

kelms1 (author)2015-07-09

In electric motor has been tried in the past and work very well as a matter fact larger ones were built during Civil War and shop marble size balls! Can you say meat grinder ! Lol
Definitely something you don't want to be down range of

kelms1 (author)2015-07-09

But here's another idea as far as being silent try using a small electric motor some of them spin extremely fast

kelms1 (author)2015-07-09

My advice is to forget the silencer it wouldn't be worth the headaches

~FROGYOU~ (author)2014-11-30

Pvc itself shouldn't be taken far above 100-120PSI. DWV (drain waste ventilation) is even worse as far as pressure ratings. Most DWV fittings such as the one you used as the chamber isn't suitable for pressure at all. Those types of parts aren't quite made for pressure applications. Be safe!

Dr.Bill (author)2009-02-20

Well there's a lot of things that are different between our countries. You should come to Rye, NY and visit a place called "Play Land". Inside Play Land you can find a little booth to shoot co2 powered BB Guns that are machine guns but they are Co2 powered. A gas powered machine. No flaming powder. They are classified as AIR GUNS and as such do not use Fire. They shoot. However if you are talking expressely in terms of Silencers being Legal For Guns, the answer is No. Originally I thought there was discussion as to weather or not this BB Gun was a fire arm. Clearly it is not. It uses compressed to a tank gas to shoot. At any rate it looks like a fun Toy. You should not use a silencer with it. Rats will never know what hit them. Bye!

Ranie-K (author)Dr.Bill2012-12-09

My personal understanding is that you legally CAN suppress it in the US as long as the suppressing part is not removable.

freddysserpent (author)Dr.Bill2010-04-30

Dude if you want a silencer in the U.S. You can apply to the BATF for licencing. Its pretty much the same requirements as for manufacture of firearms.Or so I found while I was there. You can do the same thing here in Australia except the requirements are stricter. Also Australians beware airsoft and air/co2 powered weapons are legally classified as firearms so if you want to use this stuff please be on the lookout for the johnnies (author)2012-09-01

im 13 i under stand all the cocepts and engineering of the design but due to my age some parts are hard to come by could i substitute some of the parts and maybe funnel the entrance for the bbs in the vortex to reduce jamming? (author)2012-09-01

im 13 i under stand all the cocepts and engineering of the design but due to my age some parts are hard to come by could i substitute some of the parts and maybe funnel the entrance for the bbs in the vortex to reduce jamming?

wcs873 (author)2012-04-10

Same project can be found at Hope this helps everyone.

wcs873 (author)wcs8732012-04-10

Sorry the path is: ==> Build Your Own ===> BB Machine Gun (pneumatic)

Ianman (author)wcs8732012-04-10

Which is mentioned in step 2.

Click on the hyperlink "vortex block".

TSC (author)2010-04-16

Nice 5stars!!!!!!!!!!!!!!!

Ianman (author)TSC2012-01-07


TSC (author)Ianman2012-01-08

Your welcome!

Aron313 (author)2012-01-07

Make a video. Some guns that i made with plans offline didnt fire far or ran out quickly

Ianman (author)Aron3132012-01-07

There is a video right under the main pic and description.

Aron313 (author)Ianman2012-01-08

ok thanks

Billy mahony (author)2008-09-17

What did u use for your vortex block?

Ianman (author)Billy mahony2008-09-22

Bondo, read the inst.

Billy mahony (author)Ianman2008-09-26

it looks like a solid chunk of copper or bronze.

Ianman (author)Billy mahony2012-01-07

Copper BB's will discolor it.

skidoo (author)2009-01-30

Neat project and all, I guess. But 500 RPM? That's only like 8 shots a second. And what sort of muzzle velocity are we talking? I dunno, 24+ rounds-per-second (1440 RPM) is nothing for a decent airsoft gun shooting .25 gram BBs, and I don't see why you couldn't push steel BBs at the same rate. Especially if you're using an air compressor and a vortex block. More thorough instructions would be nice, so we could more precisely suggest how to improve your rate of of fire. "A" for effort though! :-)

Ianman (author)skidoo2012-01-07

8 Shots a second sounds like to much?
Watch the video. And listen...

guitarmonk15 (author)2010-07-04

would a gravity fed magazine work instead of the vortex block? I'm thinking about a pen tube filled with bbs.

Ianman (author)guitarmonk152012-01-07

It is already gravity fed...

adrian09 (author)2010-07-12

do u hav a video of the whole process? or more detailed ones..

Ianman (author)adrian092012-01-07

Nope, going to have to use your imagination.

Billy mahony (author)2010-06-09

Does anyone have any ideas on running this off a CO2 tank, Making it more portable.I have no idea on how to regulate the flow? pressure, any help would be great.

Ianman (author)Billy mahony2012-01-07

No, you need a high CFPS rate that only a big air compressor tank can accommodate.

Do you mean running it on something like a co2 bike tire inflator? Because I had that EXACT same idea. I'm guessing it would work pretty well, but I have never tried it.

I was thinking something slightly larger (Paintball tank) but yeah, annything light and portable, how fast do you think the flow is on a tire inflator, my guess is pretty low, but it should work.

dla888 (author)Billy mahony2010-10-16

Get a CO2 regulator. Look on amazon, or ebay.

prop master (author)2011-02-01

could you modify this for airsoft

Ianman (author)prop master2012-01-07

As long as the barrel was the correct internal diameter, but why wuss the gun up like that?

rocketman217 (author)2011-06-09

Hi, could i power this with 8 gram co2 catridges?

Ianman (author)rocketman2172012-01-07


besty1262535 (author)2011-12-14

were is the other part

Ianman (author)besty12625352012-01-07

Did you mean *where is the other part*?
What other part?

Football viking boy (author)2011-08-12

those pipes 400 psi ? WOW those must be bought online

coilsinamotor (author)2010-12-01

wow very clear drawing of the block 5/5

Ianman (author)coilsinamotor2010-12-02

Thanks, But not my doing.

six shot (author)2010-11-28

hey, if you put a wooden/cardboard/plexiglass body on that, you could make the wunderwaffe dg-2 from nazi zombies.

Nandthemountingplusman (author)2010-08-19

I remember using the ordinary and old style of airgun for bird hunting when i was young. I think i can enjoy more now by availing the benefits of technological developments. Is it possible to put a scope in my airgun like what i have seen that are connected to riffles such as the AR 15 Scopes? Are these kinds of rifflec accessories adaptable to airguns?

You're gonna go bird hunting with a fully-automatic machine BB gun with an Colt AR-15 scope? You're gonna explode the poor pigeon's brain

cyborgpigeon (author)2009-03-05

that thing is NICE! ive been wanting to try something like that for a while. I think ill try to run mine off fridge pumps and rechargable cylinders when i get around to it. i know 1 liter at @ 500 psi won't run a full auto bb gun for long but thats what im gonna try. only down side is i live really close to the local gestapo headquarters. im from the u.s. these things are legal but they are frowned at by the sheepel patrol. and no something that is compressed gas powered is not a fire arm! i feel that laws that say that are tyranical bs. if you want to see something similarly Evil!? go to spudfiles dot com and do a search for "DeathRay". just look through their site first before you start askin stupid questions. they have lots of info on how to make airguns. remember no one likes to spoon feed lazy people.

 those fridge pumps take forever to pump u a co2 cylinder to 500 psi ive heard , to slow of flow

yes the small ones can be slow and tend to tap out at 275- 350 psi. example mini fridge compressor. but the big ones can be scary fast and dangerous. example full size fridge compressor or window air conditioner compressor.
do not ever attempt to use one unless you know what you are doing! its highly dangerous and not for beginners. they can output lethal pressures i cant stress that enough!  also the case around the pump is subjected to the overall system pressure. the cases can separate with potentially lethal results. there was actually a law suit where one came apart during a test at lower than the supposed rating. there has been at least one person crazy enough to do a max test on one. his was able to reach pressures in excess of 1000psi, needless to say that is an extremely dangerous thing to do. a long time ago i had one hit 750 plus psi in seconds. that was way too close to death for me. not a thing to be taken lightly in the least.

Gksarmy (author)cyborgpigeon2010-04-17

so...if one were to set several of these up together in a series with spring caps calculated to release when the pressure was around 700 in each tank/compressor...death?

About This Instructable




More by Ianman:BB Machine Gun(NOT AIRSOFT!!!!!)
Add instructable to: