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25MM Pneumatic Sniper Rifle

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***Disclaimer*** The following is for informational purposes only, i take no responsibility for what you do with this knowledge. i can not be held responsible for any property or medical damages caused by this weapon. i would advise you to check your local laws. These types of guns are illegal in some areas, and i would highly advise you against building one of these in said areas. Pneumatic rifles can be very powerful and should never be pointed at a person or animal. Lastly when dealing with pneumatics never over pressurize them and always use NFS-PW pipe (as apposed to DWV)

well before we begin i must state a few things...

-PVC can only be used at half or less than half the pressure rating stamped on the pipe when pressurized gases are used in the pipe
-i would suggest never pressurizing this cannon above 150 psi, remember its only plastic
-never store any type of PVC pneumatic with pressure still in it
-always allow a full 24hours for PVC glue to dry before pressurizing
-when building pneumatics always use metal or PVC pipe (never ABS)
-PVC is shock sensitive meaning if its dropped on a hard its very likely it will be damaged and it would be very dangerous to pressurize after damaged
-PVC becomes very brittle below 32 degrees (Fahrenheit) and is very likely to explode if pressured in such conditions
-when building pneumatics pressure rated pipe should always be used (none of that cell core or DWV crap)
-the most important part of any pneumatic are the PVC welds AND I HIGHLY SUGGEST YOU READ THIS TUTORIAL before you even think about starting this.
-when you are dealing with high velocity projectiles always remember you safety glasses
-always be sure of your back stop when shooting any form of rifle, pistol, gun, bow.... anything that can fire some vague form of projectile
-and use common sense!
-do not use un-regulated HPA or CO2 in a PVC cannon ever they are stored at to high of pressures to be safe in PVC, but if you have a properly regulated setup they can be used ( if you lower the pressure to about 100psi)

Now onto the good part...

this is my entry for the launch it challenge, it is a 25MM Pneumatic Cannon. it has 2.5 foot long one inch diameter barrel with a custom bolt action mechinism, of course we have the 3-9X40 sniper scope, and a 1" modified sprinkler valve as the primary firing valve.

The Video...

Video
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remember always wear safety goggles, you never know where or when something will ricochet especially when its traveling at 300+FPS

Fun Fact: PVC shards can't be picked up by X-Rays (this is a safety tip! don't rush or you'll get a PVC shard in you and you probably wont get it out. im not saying you should sneak one of these into your luggage and go threw airport security. it would be way to big any way)

better video coming soon

If you like this instructable please register and vote for it in the launch it challenge (by click the plus icon next to the title)

DETAILED SPECS

power source------------------compressed air
power source pressure-----100psi
chamber volume--------------45 ci (approx.)
barrel volume------------------25 ci (approx.)
c/b ratio--------------------------1.8 to 1(approx.)
firing valve----------------------pneumatically actuated sprinkler valve (a "modded sprinkler" valve)
pilot valve-----------------------blow gun valve
fill valve--------------------------female quick disconnect
fire rate--------------------------single shot, bolt action
caliber---------------------------25MM ( one inch)
projectile velocity-------------unknown (coming soon)
effective range----------------unknown (coming soon)
maximum range-------------unknown (coming soon)
optics---------------------------3-9X40MM rifle scope
primary material used------PVC pipe

I WOULD SUGGEST YOU DO SOME RESEARCH BEFORE UNDER TAKING THIS PROJECT, LOOK INTO THE DIFFERENT TYPES OF PIPE AND THERE RATINGS, HOW TO SOLVENT WELD PVC (THIS IS A MUST), HOW TO PROPERLY DRILL AND THREAD HOLES FOR FITTINGS, THE TYPE OF CONDITIONS PVC CAN BE USED AND STORED IN. THE MAJORITY OF THIS INFORMATION IS CONTAINED WITHIN THIS INSTRUCTABLE BUT IT IS BECOMING CLEAR THAT MANY OF YOU ARE NOT READING ALL OF IT. I HAVE ONE FINAL SUGGESTION BUILT A BASIC PNEUMATIC OR COMBUSTION FIRST IF A BASIC CANNON FAILS IT WILL BE LESS DANGEROUS

PS - DON'T ATTEMPT THIS AT ALL IF YOU HAVE NO COMMON SENSE OR A LOW IQ
 
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ikhan262 days ago
hello there I Hv gathered all parts and before I start making it a few questions..... how do you calculate air pressure in chamber. there is no psi meter. also can I attach psi metre on the left of quick disconnect valve?......
Grold1 month ago

I just wanted to ask is it possible that i could modify it to a paintball gun?

ikhan261 month ago
Finally after a long search i ordered sprinkler valve online store. it is of Rainbird brand. it has one solenoid on top at one end. it is black in colour. i hope it will work,....
ikhan262 months ago
hello irwinner I Hv been looking and reading all this info here. it's greatly helpful. much better than other air rifles made from pvc. so far I Hv tried hard in and around my area to find Sprinkler valve but no luck. I recently found Sprinkler valve online store in USA. before I place an order I want to confirm that it is orbit open jar online valve with two sides open like in pic. but it has some black part attached on top. so if could just clarify then really I would go ahead. now I am just waiting for reply from you ..... till then I'll keep my fingers crossed.
keyondre2 months ago

Is the sprinkler system a: "orbit 1 in. NPT green jar top valve"?
because thats the closest one i found i think it may be the same one.
Other than that i built it today and spent 75$ on everything, although i
had an air chamber built for a previous one i made, the valve was
already in it. So i re-used it because, it was the same exact design.So
if someone wanted to go make this now, id say depending where you live
it may differ( but im in PA) if ur buying the air chamber id say its
roughly $85 overall. Assuming (4-5$ for tubing, 4$ for fittings, and the
rest is tax).Ill post a pic once i finish it and paint it, im waiting
on the stupid orbit bulls#!% to hook stuff up, and test it.

nhstillman3 months ago

Do you think I could modify the barrel to shoot crossbow bolts?

nhstillman3 months ago

Can you provide a working link for the video? The pictures are great and all but I am more a visual person because I like to build my projects along with "someone" (in this case, the video). If not, that is ok. Either way, this is a great build!

MadBomber122 years ago
This is ganna sound stupid, but what's the best ammo for this rifle?
Marbles or Nerf Darts, worked for me
I'm thinking marshmallows would work well.
zelback1 hanelyp8 months ago
I think that they would explode on the way out. lol.
crazypilot0085 months ago
irwinner its wonderful work you have done can i change the barrel size to use it for paintball ammo
philip19828 months ago
THIS PROJECT IS AWESOME!!!!!!!!!! Thanks @irwinner!
ychin211 months ago
hi there! this is an awesome intructable! i was hoping to build it for a physics project.
but i was wondering if it were possible for me to connect the gas reservoir to the blowgun and subsequently connect it to the bolt assembly directly, and bypass the sprinkler valve? would it post any safety hazards, or reduce its power?
it is my first time building a pneumatic cannon, and i dont really know how these stuff works.
jaykay0071 year ago
About to make this model, Upload images after its completion
Denasdc1 year ago
And also: Why do u need coupling in the bolt action?
Denasdc1 year ago
Hello all. I'm planning to build this one with few little changes to it. But i have only one problem considering this: When the bolt action is set up: the barrel itself will move up, or it will stay and the other piece with same diameter will move to the barrel? I just can't get it. Will you help me this?
i im thinking of making this about how much did it cost you?
MakarovII1 year ago
This is a good airgun what is the projectile of this stuff reply me cause i made one and i appreciate your work good job...
fr05ty9114 years ago
instead of gluing the chamber in could you use a quick disconnect so you wouldn't have to keep refilling it and just swap chambers???
thats a god idea but the disconnect might be two small so you would have to use some reducers.
but that would be a very good idea if you were using the gun away from an aircompressor... infact i might try that
yeah you could make it snap on and off to make a fast change air tank
Wouldn't that not work because the whole idea of the compression chamber is to quickly release the air? If you could do it that way you might as well keep it attached to the compressor and forgo making the compression chamber altogether.
Syn7 shaclonts1 year ago
or use a real tank and have multiple shots. It's not the same. The whole concept here is a complete release in one shot. Hooking it to a direct infinite source requires a slightly different design. There are lots on here, just search.
Syn7 Syn71 year ago
Although, you could just carry a pressurized tank with a scrader valve filler attachment and use that to refill your pvc canister while in the field. Prolly a good idea to have a guage handy if you don't have one built in with the valve.
maybe u could hav a hwhole second tank with a female disconect at one end and a male discnnect at the other, so u could fill it at the commpresser and then when u wanted to use the cannon away from the commpresser u could fill from that
hunter11251 year ago
So if you pressurize the tank to 100 psi does it shoot well, and does tank size have a factor besides amount of shots?
mamajr961 year ago
Couple questions, do you have to use an air compressor to fill the tank each time can't you mount and second tank filled with air and leak it into the other tank to re-fil the main tank. This is a dumb one but I'm guessing you have to re-fill the tank each show right
batonas2 years ago
(removed by author or community request)
The term 'rifle' is not meant to be taken in the literal sense. The term 'rifle' has been used to describe a variety of weapons that use a stock and is to be shouldered before one fires it.

This is a fun instructable and I don't believe the accuracy of what you speak of here is required.

So the owner of this instructables use of the term of 'rifle' is more than acceptable.
and is it only one shot?
i think my jaw just fell off my face when i saw that thing
fjdutra2 years ago
Well, to get where I find this valve and how it would be worth it if I send him the money and buy a pro Brazil send me inside mines can give me an answer on my imail fjdutra@r7.com required urgent thank you for comprehension


Fabio Junio ​​Dutra
lewster2 years ago
This is incredible! Have u thought about using paintballs or splatballs (from kmart) and a 15mm barrel to shoot them? This could be used with a spring feed, or just bolt action, for an incredibly awesome paintball gun! i have another air cannon (i lie, i have 3) and splatballs work great! u get them from kmart, or maybe walmart if ur in America?
In america, you can get proper paintballs anyway
I KNEW THAT!
lolzprox2 years ago
Hey anyone know where to get that sprinkler valve? And the blowgun valve.. I live in Singapore, which none of the DIY stores sell such stuff. And any idea if i can replace the sprinkler valve with ball valve?? Thanks.
de0509 lolzprox2 years ago
haha hello there, im from your neighbouring country. yeah, ball valves work fine too if we cant find those QEV stuff. mine uses a ball valve too. its less complicated but it still is fun.
but judging from the date of your comment, i guess you may have already made one diy airgun for yourself....
A ball valve will work fine. You just have to open it faster :)
deqwer2 years ago
is there any chance that the air gun can shoot twice?
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