Instructables

Nerf Sniper Rifle

Picture of Nerf Sniper Rifle
Nerf gun made from schedule 40 pvc pipe. Extremely accurate and consistent if constructed properly. I was able to hit a 2x2 foot target from about 60 yards away precisely. Any further and the shot became too much of a gamble, and due the long reload process it is not advised. The gun Somewhat cumbersome so make sure you have a side arm for closer range.
 
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Step 1: Acquire Parts

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The pieces you chose to use are up to you. Everything depends on how you want your gun to function. You can add more tanks for more shots before you have to reload, or you can smaller tanks so the gun is easier to move, however your shots will not go as far and you will need to pump to a hire pressure to achieve the longer distance shots.

I personally only had two tanks (due to lack of funding) that were rather large. The gun is a little awkward to move around, but if you are waiting for your victim to blunder across your line of fire it is lethal.

The parts i used:

3/4' electronic sprinkler valve

1/2' pipe (for barrel)

1' pipe (for manifold)

3' pipe (for tanks)

2 metal ball valves

3 1' T-connectors

3 1' male adaptors

1' slip cap

1' female threaded cap (so that if i wanted to i could add another tank)

1'-3/4' male adaptor

3/4' male adaptor

3/4-1/2 bushing

1/2 female adaptor

1/2 male adaptor

2 1/2 couplings

2 garden hose rubber washer hose thingys

1 threaded car valve (so you can pump it with a bike pump or air compressor)

Step 2: Construct Manifold

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Drill and tap your 1' slip cap and wrap some teflon tape around the valve. Use a wrench to screw it in. BE CAREFULL NOT TO STRIP IT!!!

Next, connect all your 1' t's to your 1' pipe. Make sure you leave enough space between them to fit the tanks.

On top of these t's glue on your 1' male adaptors

on the front of the manifold glue your 1' to 3/4 threaded adaptor

At the end glue on your slip cap with the pressure valve on it.

Step 3: Construct Tanks

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Decide how long you want your tanks to be. Cap them on one side, then use any combination of bushings and reducers to get it from 3' to 1'

screw or glue on your your ball valves (mine are nice ones, i had them left over from a previous project. This kind of investment is not necessary and the pvc ones will work fine)

it helps if your ball valves are threaded so you will not have to glue on a female adaptor before you attatch it to your mainifold.

Step 4: Construct Barrel

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start by gluing the 3/4' male adaptor to the 3/4 to 1/2 bushing (preferably threaded, but if not you need to glue on a 1/2 female adaptor). This will screw into your sprinkler valves

Glue a 1/2 male adaptor to your barrel. This will screw into the assembly we just created.

Now duck tape together your two 1/2 couplings. Then drill them out so the fit easily over your barrel.

Using a dremel or drill create a gap large enough at the bottom of the barrel so you can load the darts directly into the bottom without using a ramrod. I put two hose rubber thingers on either side so no extra air can get out.

You use the coupling to slide over the gap you created while shooting.

Step 5: Misc

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Screw your entire assembly together. Bearing in mind how you want your gun to be wieghted and where it balances. Try to keep the top clear so it you have an unblocked view down your barrel.

If you would like to use an electric switch for your gun you could make a simple circuit using a few nine volt batteries and a light switch. Mine tended to lag but i only used one nine volt (which was already half dead) and the system supposedly required 24 volts.

You will find that standard darts are not heavy enough and that you would be better off making your own.

I used 1/2 foam backer rod ( i picked it up at Home Depot, ACE or True Value probably carries it as well) as the primary body of my dart. I found that it did not fit in the barrel as tightly as I hoped. I am going to try using 3/4. For wieght I screwed in a small 1/4 inch screw in the front and put a little pink duct tape around it so they would be easier to find and retrieve.

Expirement around until you find a dart that works for your gun. You can eliminate the slight arch in the foam backer rod by putting them in a pillow case and turing a hair dryer on in it for a few minutes.

I believe that if you could figure a way to sturdy up the barrel of this gun (the 1/2 wobbles around) that you could greatly increase the accuracy and maybe the range.

The main problem I am having is stability. I need to build a stand of sorts (maybe a bipod?) that will allow me to more easily adjust the firing angle. Any Ideas? Thanks
oh and by the way "garden hose rubber washer hose thingys" are called o-rings :)
Those tanks are way to big they aren't really helping your cause. Ive done a lot of exparimenting with things like this and a tank about 1/3 the size would work just as well and it would be a lot quicker to pump up. Nerf darts are very light so they require a small volume of air at high pressure to get up to speed. If you were shooting heavier objects (like ball bearings) it would make more sense to use a bigger tank.
Batryn4 years ago
If you want to make it steadier, try to slide in the 1/2 pipe more. If it still isn't steady, wrap a thin piece of duct tape or foam around the 1/2 pipe and slide it in that way.
nerfkid4274 years ago
poor can lol
how do u make the tank?
do you have different types of electric valves. I mean, are there valves which open and close directly. do you know what kind of valve the owner of this airsoft gun used?

well i like the idea but i can hear the compressor in the backround.. how would i make one without havein to haul arounda big compactor?
That's a qev (quick exhaust valve) look it up on wikipedia if you don't know what it is.
mmm... aluminum extrusion as a barrel...
That was awsome! Try makeing one that shoots paintballs next time!
That's an Orbit Jar Sprinkeler Valve (modded) connected to 1/4" tubing and a blow gun from an air compressor.
ok, thanks for the information!
From What I can Tell, It looks like a QEV (Quick Exhaust Valve) They're pretty hard to find, but they're pretty much ideal for pneumatic cannons.
its a blowgun valve
ok, thank you very much!
ill do research on it
mcmaster.com has them. They are around $100 though :( Just go on their site and search for "Quick Exhaust Valve"
ow, thats less nice... thanks for the site
I just looked around more on mcmaster and found out that if you go to the third page, they have that kind of qev for $20- $30.
really? those who open and close automatically?
can you give me a link? I cant find them. Catalog page 446?
I believe it's actually page 941. If you scroll to about the middle it says "quick Exhaust valve" it's kind of hidden and hard to find.
yes! the right-agled one look exactly the same as in the video, thanks a lot!
You're Welcome
O, only one question left: Can mcmaster ship out side the US? Does the costs increase much?
i'm not sure. They ship ups. I think i remember a place to select your country on the order form
I just looked at their order form. they do ship outside of the us. I'm not sure about shipping prices though
OK, thank you very much. I should do this my self : ]
How Qev's work: There are three ports on the valve. One for the input another for output and a third. the third one is kind of confusing. you use is do inflate it, and if you let a small amount of air out of it suddenly it opens the valve
if you look at th video you can see a black hose which is probably how he fires rapid fire
LkArio5 years ago
It would be the MOST killer rifle ever if:
Used with weighted darts/stefans like here (they have a longer range)
http://www.instructables.com/id/Make-your-own-Nerf-darts.-AKA%3a-Stefans./
Rifled barrel, maybe made of polycarbonate, which is strong, or aluminum.
Make it look like a gun, not a piping thing. Draw a design.
Mount a scope.
Install an air compressor.
It's pretty cool anyways.
BOOOM!6 years ago
I think that the tanks are too big for what youre shooting If you use a smaller tank compressed to the same pressure it probally will shoot the nerfs at the same speed It will also be quicker to refill to
nerfnerf BOOOM!5 years ago
Does anybody know how much money this project would total up to??
oh11345 years ago
Why don't you jusk use pipes for the stand and plastic bottles for the tanks?
sofaking6 years ago
you can mod the valve by drilling a hole and putting an airgun on it
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im confused how does it shoot
The green thing is a solenoid valve for irrigation. it open very fast which is why he uses it instead of a ball valve
irwinner6 years ago
in a pneumatic cannon (which is what this is) you would optimum preformence when the ratio of the chamber volume to the ratio of the barrel volume is 1:1 as the chamber volume is increased greater than a 2:1 ratio the benefits of having a larger chamber are rarely noticed. that doesn't mean its bad though i have a coaxial AT-4 rocket mock-up cannon with a c:b ratio of 7:1, its very powerful but its also inefficient.

one other suggestion mod the sprinkler valve to be pneumatically actuated. it increases the preformence by at least 4. i have two cannons with the same chamber but one has a normal sprinkler valve and the other has a modded valve, the modded one shoots the same projectile a hell of a lot further.

heres a link on how to mod these things

http://www.spudfiles.com/forums/modding-a-sprinkler-valve-t305.html
waymond91 (author)  irwinner6 years ago
Thanks, i'll use that. I was trying to figure out what the best ratio was. All i knew was that the bigger the tank, the bigger the barrel.
if you use a long skinny tank it will give you more power. but its up to you on whether you would like to try it
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