25MM Pneumatic Sniper Rifle

Step 1: The Parts...

we will be making this particular pneumatic out of mostly PVC so it is relatively inexpensive to make. here is what your going to need.

Parts...

( 1x ) 2" PVC cap
( 1x ) 2" PVC coupling
( 1x ) 2" to 1" PVC bushing
( 2x ) 1.5" PVC couplings
( 2x ) 1.5" to 1" PVC bushings
( 1x ) 1" PVC tee
( 2x ) 1" PVC 90 degree elbows
( 2x ) 1" PVC male threaded adapters
( 1x ) 1" to .75" bushing
( 1x ) .75" PVC cap
( 1x ) .75" PVC tee
( 3x ) .75" PVC 45 degree elbows
( 2x ) .75" PVC 90 degree elbows
( 1x ) female quick disconnect 1/4"
( 2x ) 3/8" by 1/4" compression fittings
( 1x ) blowgun valve
( 1x ) 1" sprinkler vlave
a few inches of 1/4" ID flexible tubbing
assorted bits of 2", 1.5", 1", and .75" pipe

Tools...

a dremel
a band saw
a drill (preferably a drill press)
PVC primer (make sure its primer and not cleaner or it could end badly)
PVC glue

Comments

[fredyvega10]

PODRIAS PONER LO QUE SE NESESITA EN ESPAÑOL PORFAVOR

[GhostSade]

What do you mean by the female quick disconnect??? I HAVE NO IDEA WHERE TO FIND IT! I don't know what it's called, I don't know where to find it, I don't know how much it would cost or anything else about it. This is a great tutorial but it doesn't describe the female quick disconnect ANYWHERE.

[GhostSade]

Nevermind, I've been researching pneumatic launchers for at least three weeks now, and I FINALLY found the info I needed. http://www.spudfiles.com/spud_wiki/index.php?title=Quick_disconnect But I still have one more question, one which will probably be answered before you guys can... I understand that the female coupler quick disconnect thing is threaded into the chamber, but since it's female, does it attach to something like this? http://doitbest.com/Air+Hoses+and+Fittings-Plews++Lubrimatic-model-21-505-doitbest-sku-589462.dib That would allow me to thread that in there, I would think. Also, one more question. What exactly plugs into the female coupler? I mean I have an air compressor, but it's got a tire fitting on it. Meant to be used on tires. What, isn't that called like a tire chuck or something...? Anyways, how can I fill this up quickly, I mean what exactly can plug into the female quick disconnect piece? I get confused a lot. These questions will probably be answered though, but answer them anyways so other people can see.

[stickz495]

how do you attach the quick disconnect? the one i got is female, but is only threaded on the inside....

[jpe1456]

it is another piece that has male threads on both sides

[Telecredible]

I am pretty new to this kinda stuff and my friend introduce me to this page.I instanly love this monster. But there is a major problem even if i wanna make the weapon.I am from singapore and i don't know where get most of the parts and my parents surely will not allow me to get do stuff but i can get the part and make them myself.Like the valve I cannot order for the net and idk how to mod it.I would appreciate If anyone could help of me.And if anyone can give me an estimated price of everything

[jpe1456]

if you dont know how to mod it yet maybe you shouldnt make it until u have done more research and understand the concept behind these and the dangers dont forget the dangers

[uzairsagitarian]

HELP! HELP! HELP! HELP! QUESTION: I have found in my local market (PAKISTAN) the pipes with following ratings (PVC 1" SCH 40 PSI 450 ASTM D-1785) and (PVC 2" SCH 40 PSI 280 ASTM D-1785) Does that mean that they have pressure ratings of 450 and 280 PSI respectively? Help would be reeally appreciated

[jpe1456]

Yes they can hold 450 and 280 psi but remember pvc was never meant for air so cut the psi rating in half and u should have an accurate psi

[Pyro_Freak]

no their both 40 psi well i asume that they are and the 450 and 280 are just code

[seabeepirate]

SCH 40 is Schedule 40. I think it has something to do with the thickness of the pipe wall. Most SCH 40 pipe can handle at least 180 psi, but that's as much as I know about it.

[airgun_expert]

SCH40 is a specific thickness. SCH80 is double the thickness. the PSI ratings are different with different diameter pipe. 1/2 in SCH40 would hold appox. 350 PSI whereas 3 in. SCH40 would hold appox. 180 PSI. this is because PSI is Pounds per Square Inch so the more surface in square inches, the more pressure applied to the overall structure.

[saxman31]

can this be used for airsoft

[MrRodrigez]

 lol shoot paintballs and call it a grenade lancher

[saxman31]

 good idea. by the way  im not that stupid i meant put an inner barrel in it

[MrRodrigez]

 well yeah, but i've tried that, and could never get a nice seal

[siggi]

airsoft it fires a co2 cartridge if it hits u it could break your bones.

[uzairsagitarian]

Can you Please tell me from which type of store can i get "( 1x ) female quick disconnect 1/4" 3/8" by 1/4" compression fittings, blowgun valve, 1" sprinkler vlave" (i.e sanitary, air fittings etc.). Or tell me any online store, I will be gratefull

[5George5]

I'm not sure where you live but Lowes or Home Depot should carry those. Maybe Ace Hardware. Very Nice instructable.

[keegster25]

How long are the pieces supposed to be???????

[keegster25]

nevermind

[micronxd]

I am SOOO gonna make one of these... (was gonna build a fully automatic CO2 powered BB gun, but this i way cooler) I'm gonna use multiple pressure chambers tho... just so all i need to do between shots is drop the projectile in. thanks for postin!

[santdogg]

Hey how does using multiple pressure chambers work to make you only have to put the bullets in after each shot?

[Dr. Explosion]

You would only use one chamber per shot, and then fill them all up at once when they are empty.

[fcaetano]

Hello Irwinner, That gun is incredibly beautiful, but how is it`s loading system? Is it automatic? I didn`t understood that because in your diagram, there were no "bullets compartment", do you know what I mean?

[Dr. Explosion]

Its just a single round, bolt action. You open the bolt, put in a round, fire, and repeat. There is no clip to hold several bullets, you just load them as you fire. His video is messed up on Instructables, but watch it on youtube here, it is pretty self explanatory.

[spazbagg]

wats it shoot?

[apod]

make ice chuncks a couple of inches long by freezing them inside a piece of pvc the same diameter of the barrel

[Stavroz]

what the @$^{%&% is a male threthed adapter?? plz anwer}

[Derin]

a male threaded adapter of course

[emuman4evr]

http://www.sealtite.com.au/images/prod_image_383.jpgIts a threaded adaptor that goes _inside_ another threaded adaptor. The males always goes into the females, they got the name from well, you figure it out... =P

[dtfgator]

wow.... I build a mini marshmallow gun like this... these are pretty awesome..

[TheWizard]

This might be a dumb question but, how long is your barrel and is it 1"? I didn't see any specific pipe lengths on the materials list. also, does the length of the barrel and chamber matter on a pneumatic, if so what lengths did you put on yours?

[irwinner]

yes the pipe legnth were intentionally not mentioned for two reasons. firstly i made them up as i went (a few inches wont make much of a difference), and secondly it was meant to weed out stupid people (you know the type who would use something like this to shot at cars and get arrested then get a bunch of negative press on homemade cannons) the pipe is 1inch i will tell you that, it is specified in the diagram in the first step. as for the other measurements use items with known lengths to guess how long they are (**hint**sprinkler valves and pipe fittings have defined lengths)

[Xxbmxlord4lifexX]

you sound like you know alot....tell me....how is the sprinkler vavle modded to be able to shoot like that......is there pressure in that or something or what???

[irwinner]

the valve works on pressure imbalances. when there is more pressure above the diaphragm than below it the valve is closed. when there is more pressure below the diaphragm than above it opens, the faster the pressure changes the faster the valve opens. by modding the valve the pressure are able to change very quickly

[SilverGeneral]

Very nice gun here. Do you have any suggestions as to where I could find a quick disconnect suitable for a disconnectable air tank? I.E. I want to be able to pressurize several air tank components, and then connect them to the gun for use, like a removable air cartrige.

[irwinner]

with the system your proposing the disconnect will serve a a huge bottleneck, most are only 1/4" (the primary valve is 1" in diameter) this will limit the flow greatly

[pyromaniac12321]

I liked the gun and the looks are awsome, i found this and as soon as i did i showed my friend and now me and him are gonna make one for ourselves, but we wanted to make sure we could get the customized sprinkler valve so were gonna get it on bcarms.com. Did you get yours there?

[irwinner]

i know the guy who runs the sight his work is very good quality i have not ordered a modded sprinkler valve from him but he has got me several other hard to find... well we will just call them "materials"... from him. the valves he has will most likely be superior to mine (he uses new sprinkler valves, i used one i dug up from the ground) so you have nothing to worry about. if you have any trouble tell me and i will talk to him for you.

[joekickass345]

hey thats so cooool whats bowgun vavle?

[irwinner]

its a valve commonly used with air compressors to dust things off, its pretty much a push button valve in a handle which vaguely resembles a trigger

[buildingteen]

This is one beautiful piece of engineering my friend! May i suggest a more rapid fire idea though instead of pressurizing your cylinder to shoot a co2 cartrige why not have a spring loaded firing pin that strikes a live c02 cartrige? of course the barrel would need to be the right size so you dont have to wrap it in duct tape every time. OR what about a paintball c02 cartrige?

[black hole fun]

rapid fire for this project could be dangerous. as it says in the intro, PVC becomes very brittle below 32 F. firing many shots from a CO2 cartridge or any compressed gas supply would lower the temp of the gun very quickly. especially where the gas goes through. it would be best to stick with 1 shot at a time. you don't want the thing exploding on you.

[irwinner]

on top of that co2 cartridges make very inefficient "rockets" for lack of a better word because they barely put out enough power to overcome there own mass. i would have to move to a combustion if i wanted to make it semi or fully auto (well reg'ed CO2 would work but would cost a hole lot)

[EragonShadeslayer]

If you have to ask, you can't afford it. Lol just kidding. It shouldnt be that much. Buildingteen: i dont think it would work cause it might over pressure it. but thats just mee

[Mad Man12]

how much does all this stuff cost