Picture of Semi-Automatic NERF Longshot
The first question I often get about this creation is "Why?." The answer is quite simple, I am an engineering student at Stony Brook University. We play a game on campus called "Humans vs. Zombies." That fact coupled with my over competitiveness, and my drive to engineer things most people wouldn't is what ultimately spawned this NERF gun. 

Although it may not be the first ever made, it certainly is one of the best to date. I would classify this as a prototype, it is far from perfect but it DOES work. Unfortunately I was only able to use it for a few days of the fall 2010 SBU HvZ game as it was damaged when a zombie caught one of the hoses and cracked the shell. It is of course fixable I just would rather make a new more improved version (Flywheels.... that's the only teaser you're going to get ;). 

This Instructable will hopefully be viewed by a few other forums as I hardly have the time to even write this.

DISCLAIMER: Modifying a NERF gun in this manner will permanently alter it. This instructable should only be used as a reference, as your specific modification will be different. NEVER use a CO2 canister that has not been properly filled. This modification should only be attempted if the proper tools and safety precautions are employed. 

Why do we go all out for HvZ? Because when else are we going to be able to deck out in tactical gear and run around campus with NERF guns?..... THAT's why =)

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A sample of the magnificence:

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zman12041 month ago
Being shot with this thing must hurt can I just use an off brand C02 tank?
bpauza7 months ago

What tank and regulator did you use? Thanks :)

Delsl4 years ago
Just curious what Solenoid did you use? I'm working on a similar project with a nerf maverick and I'm just trying to figure out what kind of voltage I'm going to need.
Philysteak527 (author)  Delsl4 years ago
I used one of these [Solenoids

But in your case you don't need a 3 way valve, you could use a cheaper one like [This].

If you are planning to hook 12 gram CO2 cartridges strait up to a valve then these wont work, the output pressure of those cartridges is around 900 psi. 

900 psi vs the safe 120. Hmm, that will explode.

Well that is certainly good to know; my original plan was to use a 3000 psi nitrogen tank I had laying around from paintball. Do you think it would work if I had a regulator between the tank and solenoid?
fierwall5 Delsl3 years ago
the tank is 3000 psi but the psi leaving the tank is 800 or 400 psi depending on the tank and then the gun steps that down to whatever pressure it uses so if you want to use it for a Nerf gun try using a regulator from a gun and go from there.
Philysteak527 (author)  Delsl4 years ago
A regulator is necessary, i'm not very up to date on the paintball parts available, but if you could find a regulator that would bring it down to 150 psi you could hook it directly to the solenoid. They do make solenoids that can handle the higher pressures... just not for $25

this is a fine piece of nerf weaponry. But I have neither the equipment nor the patience to do this. Instead, I amped up the voltage on a Stryfe and gave it a Call of Duty Advanced Warfare paint job. A recon barrel and raider stock was used, and painted too. Barrel modded to have PVC sticking out to lengthen it.

llima12 years ago
okay heres a question why not use a solenoid to pull the plunger rod back instead of using air? and just put a battery inisde the enormous free space the longshot has inside of it
Philysteak527 (author)  llima11 year ago
The power required to activate a solenoid that powerful would be too much for the amount of space available.
jpennels2 years ago
I know the second version is much better, i still prefer the look of this. It just looks so much nicer!
Philysteak527 (author)  jpennels1 year ago
I have to agree, some day I'll get around to making one from scratch to look just the way I want.
Musicman413 years ago
What happens if the tube gets pulled off or cut? Is it hazardous, or are there safety mechanisms?
Philysteak527 (author)  Musicman411 year ago
If the tube gets pulled off or cut it just vents CO2 until you shut the tank valve. The pressure is limited to 140 psi so not much more than a shop air compressor. The bolt mechanism works best at 110 psi and there is a burst disc on the CO2 tank so no other safety mechanism required.
junits151 year ago
That looks awesome! Just a thought I had, would it be easier to make a longer bolt and skip the bolt sled entirely? Then the bolt would push the dart into the barrel and fire it. Eliminates the need for the charging handle too. Or are the darts too prone to bending for this to work?
how much did this all cost ?

i know i want one

Trust me I'm a doctor
THATS HOT could it shot paint balls
gbredemeyer3 years ago
haha, as a past nerfhaven user, much respect on this. I love it. I've done some homemades involving hpa tanks and pressure washer valves...yeah..it was fun. Very cool though and impressive ranges you listed there when using a larger chamber.

-Graham, www.pypline.com -The online community for makers
jumpingcat4 years ago
lol that is funny where everyone is all normal and you have all your tactical gear on in the middle you look like a ninja (that is good)
hjklkjh4 years ago
OMG! that is SO SICK
gentoo474 years ago
alexw21504 years ago
What program is that?
isaacjonv4 years ago
dude u should take dart with the tip ripped off put a bic pen in it and glue that into the barrel of the gun and turn it into an AIRSOFT GUN
mrelement4 years ago
put a masterkey on it or some sort of nerf grenade launcher thtatd be awesome
that would be epic
isaacjonv4 years ago
Your insane dude!!!!!!!!!!!!!!!!!!!!!!! Thats beast!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
taowyman4 years ago
did you take this apart if not would you sell that for like $30
this is INSANE!!!!!!!i have a longshot (already modded:))but i probably wouldn't risk doin this even if i had all the tools and things but i would love to do this and mebe improve range a little( or a lot!!!) if i had about 20 longshots lol 5/5 stars from me we just need more people like you!!!! :)
joh544 years ago
that is so awesome!!!
kooyon4 years ago
soups1014 years ago
i think this thing rocks of course its better than mine
lazyboy134 years ago
very cool man!! theres another guy on youtube with a gun with the same function as ur gun. only thing is, u should give it a badass paintjob, that would be really awesome and make pple think twice before shooting u!!
what you have essentially made is an open bolt autococker paintball gun, you should look up how a sspyder paintball gun works for your next build, i could give you a link of an animation if you would like, it would be far more efficient and you could get better range at a lower psi
abadfart4 years ago
im going to try with a old paintball gun
so when you have a BIG Nerf war dose the host supply the darts or do you bring your own
Cheezpaper4 years ago
Lol awesome mod. But since I'm too lazy to read this, can anyone tell me what the co2 tank is for?
Isn't it obvious?It's probably not there to give you a nice breeze,is it.
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