DanTDM (author)2014-02-02

Wierd Glitch

LiftAndLove (author)2013-02-18

In the US, you don't need a 'gun license', because it doesn't exist. You need a 200$ tax stamp, and a Class III/II Weapons License to buy a silencer.

bighead5454 (author)2011-12-31

Would a shorter barrel increase or decrease power? It would provide less friction on the ammo, but also provide less length for the pressure to push the ammo, so which would prevail?

de0509 (author)bighead54542012-01-13

barrel length shouldnt "increase" power. it merely makes the energy more efficient. with a short barrel, the projectile gets out fast and the extra pressure will be ejected as well and just wasted. try measure your pressure in atm. it would roughly indicate how much it would expand. i.e. 2 atm will expand to 2 times the chamber volume.

now V = Ad. and we know that the cross sectional area of the pipes are roughly same. so just use length instead of volume
. i.e. 50 cm pipe for chamber at 3 atm shold expand to 150cm.

chamber length + barrel length = final length of air
50 + X = 150
X = 100
so no use of making the barrel longer than 100 cm.

but remember that friction exists and the air cools off on expansion. so it wouldnt expand to 150 on the dot. so, instead of 100cm barrel, cut off some at the end

hope im not wrong, but hope this could help

LiftAndLove (author)de05092013-02-18

For everything that has a barrel, there is a 'perfect length'. Where its at the point where its most efficient. If the barrel is too long it will lose momentum because the gas or air is expanding, but too short and it wont expand enough.

bighead5454 (author)de05092012-01-22

Thanks for the amazing explanation (that wasn't sarcasm). It helps, and I think is is interesting how even the simplest types of math can be confusing with explanation (I first saw the math, and my jaw dropped, then looked more closely).

stevenh429 (author)2011-11-01

If you put a t-angle on the barrel with a length of pipe and add a locking tire chuck with an air-compressor...could you make this semi auto? I am going to make this (my 4th airgun, 3 are ball valvers :D)
p.s. put marbles in the t-angle?

LiftAndLove (author)stevenh4292012-02-27

im going to use co2 instead, and then i can maybe make it semi, or possibly full even. make some marble mags.

LiftAndLove (author)LiftAndLove2013-02-18

I never remember reading this ible, and I was browsing the comments and found mine XD

AudioMaximus (author)2011-11-21

I gotta say that building this as only a 12 year old is quite impressive. Im only 16 and I am on an FRC robotics team (electrical subteam co-leader!) so i work with these kinds of things a lot. nevertheless, i love the fact that younger kids are getting into this kind of stuff. Kudos to u, good sir.

LiquidLightning (author)2011-08-08

Nope, no license needed. At least in the US, I remember just walking into big 5 when I was twelve and buying a high power rifle scope, they didn't say a thing except "Thanks come again".

syco kid (author)2011-02-08

hey does it have to be a car tube valve or can it be a normal push bike tube valve

LiquidLightning (author)syco kid2011-08-08

They are usually exactly the same, except that car valves are seperate pieces and bike valves are integral to the inner tube.

B00GYman (author)2011-04-30

why is a sprinkerler valve better? what is the advantage?

Because the way they are designed makes it so it is a lot easier to release all of the air at once, where ball valves depend on user speed. The sprinkler valves allow more air out quicker thus resulting in a faster and more accurate shot. Also, its much less of a pain to squeeze a trigger than to rapidly twist a valve.

apples!!!!! (author)2011-05-12

I watched that video.

Do I bloody like apples? That pained me.

...on a more serious note, excellent build.

cloveless (author)2011-03-27

Excuse can somebody plzz tell me wat does "over under bit" mean on one of the pvc pipes when u hover your mouse over it???????!!!!!!!.............PLEASE REPLY I WANNA SHOOOT MANY MANY SQUIRELS

PKTraceur (author)2009-01-18

NG audio portal rocks!

blugyblug (author)PKTraceur2009-01-19

I know! Dimrain47 makes the best techno. My favorite is TT or maybe The Prototype..

ElvenChild (author)blugyblug2011-03-14

I prefer the kriotube and the piano translations made by fans

saukmulti (author)2011-02-27

i'm feeling stupid
i don't know if im stoopid
but how many valve does it used??
can u make a video for making them

cohlms (author)2011-02-25

does the sprinler valve let all the preasure out at once or is it controllable ?

dinu555 (author)2010-12-19


ABOUT HOW WE LOAD OUR AMMO..................


wardog (author)2010-10-14

Can i use marbles as my ammo? :DD

awaite (author)2010-09-29

Do you reckon u could do some small game hunting with this gun like rabbits?

Thomas Crowe (author)2010-07-16

Not everywhere! Murder is!

brum (author)2010-06-28

Hey can anyone please give me a hand, i have made my gun but even at 85 psi the diaphram wont pop up and let all the pressure through and i dunno y. its not the spring cos i took it out and it made no difference, u said u used 40 psi maybe the rubber is stiffer or the whole in the diaphram is too big just wanna get opinions.

brum (author)brum2010-06-28

This project cost me approximately $80AU

brum (author)brum2010-06-30

Never mind i found that the hole in the diaphragm to let the air through and where the guide rod goes was to big a gap so i filled the sides of the guide rod with hot glue, and um, WOW WHAT A HOME-MADE WEAPON, CRAZY POWERFUL AT 80-85 PSI, HAVEN'T TRIED ABOVE THAT (compressor restrictions) highly recommend these concepts but be creative and come up with a slightly different way of doing it like I did. GOOD LUCK TO ANYONE TRYING THIS! WELL WORTH IT WHEN U GET IT RIGHT...

Vulcanator (author)2010-04-06

 Does anyone know of a reliable way/source of cheap ammunition for a 1 inch barrel? other than what was mentioned above..

if you had a 15 mm barrel like my spud rifle, you can get a 4 inch galvanized nail and pit it down the actual center of a nozzle from a hand silicon putty gun thing.
like the ones on the end of liquid nails.

bombmaker2 (author)Vulcanator2010-05-01

You could use plaster of paris lugs in the barrel. There's an instructable about it somewhere but i can't recall the name.

brum (author)2010-05-25

Not in Australia mate, im an aussie with a firearm licence and i know u dont need one to buy a scope, however i am quite sure that silencers are illeagal in australia, especially concidering that they have banned hand guns. i am going to make this only a bit more snazzy. Got a scope that i bout ages ago for an air rifle, 12x zoom and also a bolt action so that the ammo doesnt have to be barrel fed. Marbles will be the ammo. Just with the modding of the sprinkler valve i have found one (also know i found as a solenoid valve but even your local plumbing expert may not know what ur on about) the one i have has a plasic diaphram guide pole and now solenoid or flow control (less work) is the best option just drilling next to it and tapping the hole and inserting the adapter? also with the hose that goes to the trigger anything in particular (pressure rated)?

thelastonekills (author)2010-03-26

i made one and nuts and bolts are cool ammo. but ferrite core's with silicon in the middle are fun as hell!!!

bombmaker2 (author)2010-03-25

I don't know exactly how I'm gonna do it, but once I build an exact replica of the Barret M82A3 .50 caliber sniper I will find a way to fit this gun (with some slight mods) into the case.

messmaker (author)2010-03-21

Aussies rule =D

Not many of us on here blugy =]

2bigbros (author)2010-02-12

i made it and it looks awesome!!!!!! excepted im making mine for paintballs

knuckel (author)2010-02-07

Mine does like the same stuff except from like 150 feet away

igaara (author)2010-02-05

im new to this so i wanted to know how to pump the air in the gun. Is it through the air tube from the tire? Any help is greatly appreciated.

bowmaster (author)2010-01-22


fede casagrande (author)2010-01-14

Did you realy think we nead more weapons to play with???

Realmente pensas que necesitamos mas armas con las que jugar???
a Qué?

desde SudAmerica.

F- (author)2009-11-27

I like your design's key features
-long accurate barrel
-large volume of air

I had one but the air tank exploded so I am looking for a design with allot air volume so I wont need as high of a PSI.

Great Job

rownhunt (author)2009-11-16

How much will this all cost?

LkArio (author)2009-01-30

That's pretty cool, but a smooth bore barrel is not something a sniper would use... It'd be awesome if you could rifle it... Does it recoil at all? I owned a spring pellet gun, it recoiled quite a bit. I haven't seen any recoil at all when pneumatics are shot. Can you feel anything when you fire?

cuchulain92 (author)LkArio2009-11-08

Projectiles can be stabilized in any of three different manners:
spin-stabilized (usually done by a rifled barrel)
fin-stabilized (often found on rockets)
mass-stabilized (rare)

Spin-stabilization relies upon gyroscopic action to keep a projectile from wobbling. Fins can be used to impart spin, or to stabilize a projectile with a high enough length:diameter ratio. Closer to 3:1, spin is more effective; at 10:1 fins work better.
High accuracy can be achieved with either method.

blugyblug (author)LkArio2009-01-30

HAvent seen any? Really? This definitely has recoil, the tip goes up like 15 cm at ~50-60 psi. When you shoot water it goes up like 30cm (a foot)

QuiksilverRox (author)blugyblug2009-07-03

My friend has one with a 1 barrel thats 3' long with about 5' of 2 pvc for the chamber. We filled it up with water and I shot it. I got a huge bruse!

dasgemuse (author)LkArio2009-06-16

you can buy rifled pvc barrels for potato guns. they exist

blugyblug (author)dasgemuse2009-06-17

Yeah you can make them yourself too :P Its kinda weird, you have to hammer nails through a long piece of round wood that fits your barrel with like 1 or 2mm of space. You hammer them in so that a tiny bit shows through the other end. You hammer like 3 nails in, then put it into your barrel and twist as you push it in. Id rather not do it, this is accurate enough for about 30-50m (with those air hose bullets, which arent that great for shooting.) Couldnt be bothered making shaped bullets with plaster and stuff...

Loveofchaos (author)LkArio2009-02-17

Yeahhhh were gonna rifle a PVC barrel..... for a potato...... wow....

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