Introduction: 18 Shot Nerf Strongarm

Picture of 18 Shot Nerf Strongarm

After building my 18 shot Nerf Maverick I have been asked countless times, whether it is possible to build an 18 shot Nerf Strongarm. So I decided to give it a shot (no pun intended :-)).
In comparison a few more alterations are needed and the pieces that connect the barrels are a bit more challenging, but other than that it wasn't overly complicated to build. I still urge you only to attempt this mod, should you be convinced that you are able to execute it. Otherwise you might damage your blaster.
Even if you are not planning on building an 18 shot version of the blaster and are just generally interested in modifying a Strongarm, I think this instructable is worth a read (especially the first step).

Take a look at the video:

Btw. I am completely aware of the irony of taking a blue-orange-white blaster apart in order to sand and prime it and afterwards painting it blue-orange-white again... but as some of you already noticed in the comments, I wanted it to look like something straight out of Borderlands.

Step 1: Common Misconceptions + How to Increase the Speed

Picture of Common Misconceptions + How to Increase the Speed

I have read multiple times that people suggested to remove the what they call "air-restrictor" from the plunger and to fill the small hole that is on the top (as shown in the third picture).


Even though they might tell you that this improves the strength of you blaster, it doesn't! In fact, this actually damages your blaster, because it is not an air-restrictor, but an ingenious method to prevent dry firing. Since after building this 18 shot blaster I had some plungers left over I tried to do the mod and to compare the results by measuring the dart speed with a chronometer.
I also removed the barrel posts from one barrel, to measure the effect. Unless you are planning on using Stefans (If you don't know what I am talking about, here is an instructable) I wouldn't suggest you to do so either, because it also decreases the strength of the elite darts.

The only effective way to improve the dart speed that I found was to change the spring! The second picture shows the improvement after adding the Orange Mod Works (OMW) kit (from here).

Step 2: Stuff You Need

Picture of Stuff You Need
  • 3 Nerf Strongarms (e.g. from ), or one and two 3D printed barrels
  • 2x15mm M4 screws, M4 washers and M4 cap nut
  • Jb-weld, plastic weld (e.g. from or some other type of modelling clay.
  • 3D printed parts (you can probably make the pieces from wood, too, but 3D printing will save you a lot of time)
  • Silicone Grease (not necessary, should you get the "Unleashed Solid Final Stage Kit")
  • Saw
  • Strong glue
  • Sanding Paper


Step 3: Open the Blaster

Picture of Open the Blaster

Start by taking all the screws out of the outer shell. Afterwards take the barrel out. The grey part in the front is loose and can just be pulled off. The one the back is screwed in place, in order to get it off you will first have to pry the two orange shells apart. Start by removing the two screws that are holding them together. You will have to move the grey piece around to reach them. Pulling the pieces apart might take some effort, since they are pressure fitted.

After you have pried the pieces apart, unscrew the small screw in the bottom, to remove the part in the back.

Step 4: Modify the Shell

Picture of Modify the Shell

In order to being able to rotate the barrels use a saw, or a Dremel to remove the rail on the bottom as shown in the pictures. The next thing you will have to do, is to remove some of the plastic from orange front piece, as shown in the second picture. Do so until both sides have the same height.
To make my life easier I decided to design two small plastic pieces, that hold the screw in place. In order for them to fit you will have to remove the small blue rail that is in the way, as shown in the third picture.
As you can see in the fourth picture, I decided to add an extra screw hole, by drilling through an existing hole and filling the end with jb weld. Feel free to do so, too, but it is not really necessary.

Step 5: Filling the Holes

Picture of Filling the Holes

One of the pieces is designed to hold the screw that goes into the front. Glue it in place, as shown in the first picture. Afterwards glue it to the orange piece that goes in the front. It should fit perfectly into the hole.
Glue the pieces that hold the screw in the back in place (as shown in the second picture).

I used jb-weld to fill all the holes, but even though it is extremely stable I would suggest using something with a higher viscosity. The best way I found to prevent the filler from connecting the two shells, is to use tape, as shown in the second picture. Also wrap it around the screw, in order to being able to take the shells apart later.
Once you are done, sand the pieces.

An other thing you will have to do is to shorten the pins that go into the barrels. So that they don't infer with the front of the blaster.

Step 6: Painting

Picture of Painting

To get the paint to stick perfectly to the blaster, you should sand it. Afterwards prime it and paint it.

Make sure not to paint the bottom of the inside barrel or the inside of the outside piece (click on the second picture to see, what I mean).

Step 7: Assembly

Picture of Assembly

As you can see in the first picture, I added a LED to the side of the blaster, but that is of course completely optional.
Shorten the screws to the correct length. It is easier if you screw the cap nut on, before assembling the barrel. Glue the washer to the connector, as shown in the picture.
Place the connector that goes in the back on top of the barrels, as shown in the picture and add some lube, to reduce the friction. Afterwards reassemble the barrels. Screw the connector that goes in the front in place, as shown in the fourth picture and add some lube to the cylinders.

Step 8: Assembly

Picture of Assembly

The assembly is easier, if you place a book under the blaster, as shown in the last picture. Don't forget to reattach the small spring.
The last picture shows, how the final assembly looks like (click on it to see a bigger image). The main spring can be attached by screwing the old one off and the new one on. Make sure that the plunger is positioned right.

Congratulations, you are done.


shreddherring (author)2017-10-03

Really interesting concept, and well designed.
I know this is an old post and you probably get asked these things a lot, but do you think you might ever try doing something similar with the mega cycloneshock?

JohnB859 (author)2016-09-22

Would it be possible to do this using three 3d printed 9 shot cylinders? Just curious. Thanks!

erana_reborn (author)JohnB8592017-06-17

Could you post a link to the file for those 3d cylinders you mention? I'm having some trouble finding them online

JTronix (author)JohnB8592016-09-28

Yes, But it is not reccommended because 3d prints are not nearly as clean, durable and precise.

JohnB859 (author)JTronix2016-09-28

Thank you!

erana_reborn (author)2017-06-17

Incredible mods, both this and the Maverick one.

I'm curious about a few Nerf mod things that maybe you could answer:

- Would it be possible to do similar multi-cylinder modifications to newer revolver nerfs like the Disruptor or the Hammershot? I gess not, because those aren't swing-out cilinders, but this must be asked.

- Are the cylinders of the different Nerf revolvers interchangeable (other than cosmetic differences) for multiple-cylinder mods (that is, do they have similar rear "working parts" and dimensions), or do they have differences that prevent you from using, say, Hammershit cylinders in a Strongarm mod?

and, lastly, but not least,

- Have you given any thought to making an EIGHT-cylinder + shield mod like this famous gun, the Enouy revolver? ;-)

(image source:

100101010011001100101 (author)2017-04-15

can you make a four barrel zombie strike flip fury?

Spaceman166 (author)2017-01-08

Can you make a four drum mod

MarcM88 (author)2016-12-21

OK... you've made a 18 shot maverick and a 18 shot strongarm... do you think you can make instructions on how to make a 18 shot cycloneshock???

EphraimH1 (author)2016-12-12

why cant i open the .stl

Andy isr (author)2016-07-24

is there a .stl for the barrel?

ArnavV1 (author)2015-11-04

From where you we can buy these parts

Lolorun (author)ArnavV12016-02-18


Moodle2 (author)2016-02-05

I won a strongarm as a door prize and was frustrated at the constant reloading. Thanks for making this instructable!

Jyra Sapphire (author)2015-10-11

You can remove the air restrictor as long as you do it through the hole in the front (NOT EASY!!). This leaves the buffer at the back which the plunger strikes.

colinN6 (author)Jyra Sapphire2016-01-13

actually I saw a post of a guy who chrono'd his darts before and after removing the "air restrictors" which are actually just dry fire prevention mechanisms, and he found a large decrease in dart velocity and accuracy, and stated that the only way to get more power is a stronger spring.

severdhed (author)2015-12-06

This is fantastic. Great job

JamesRPatrick (author)2015-09-12

Great instructable and I love the paint job! Very District 9.

LyellR made it! (author)2015-08-15

Great Job Brittliv!!!

BrittLiv (author)LyellR2015-08-31

very nice!!! Thanks for posting a picture!

pixelgun3d (author)2015-08-31

how long do you think it would take for this mod to work. ( Not including paint and primer and sanding.)

BrittLiv (author)pixelgun3d2015-08-31

That depends on how clean you work, but you should bei able to finish it in a weekend

pixelgun3d (author)2015-08-31

i need to make this gun in about a month. Should I just 3d print it or just carve it from wood. Thx

LyellR (author)2015-08-15

André LMS (author)2015-07-09

Hello! Can you send the pictures of the mold each piece ?

Long range (author)2015-06-10

How do you make the thing that can connects the three drums

anti_communist_fish (author)2015-05-13

How did you get that effect with the paint? Sponge?

enrique9821 (author)2015-03-18

Im not sure if these screws work please tell me where you bought your screws if they dont

ChrisC16 (author)2015-02-22


SteveD5 (author)2015-02-09

Hi, do you have a stl file for the barrel?

ChrisC16 (author)SteveD52015-02-22

yeah i really need it too!

AlexaL (author)2015-02-04

What kind of paint did you use? What was your procedure?

zman1204 (author)2015-01-24

I love it!!!! Very creative. I was able to improvise off of your instructions and I was able to make mine work properly w/ a 3% failure rate

bleeNGA (author)2014-12-04

This is absolutely amazing. I love the triple barrel mod and I love the paintjob even more! Amazing. I don't know if you've seen it yet, but Nerf is coming out with a new blaster in the Zombie Strike series called the FlipFury. The Nerf Zombie Strike FlipFury has two barrel chambers that can be "flipped" over and rotated into place. Nerf had to have seen these double and triple barrel mods and effectively incorporated the modders work into their official line of products. I did a quick write up on the Nerf FlipFury on my website (link in profile)

Ethand1 (author)2014-08-10

Hey I was wondering if i could buy the drum connecter peice thing. Just send me the Ebay, amazon or whatever you use's link. Thanks in advance

BrittLiv (author)Ethand12014-08-11

Hi, I am really sorry, but since I live in Germany, the postage would be very high.

rendord (author)BrittLiv2014-11-03

I live in europe (netherlands) i was wondering if i would be able to buy the 3d parts if not then ill just stick to single chambers :D

bartek_336 (author)2014-11-03

Can I buy that 3D parts? Beacouse I haven't got 3D printer.

MrMercenary (author)2014-10-22

Looks like a Maliwan pistol from borderlands

trollface34 (author)2014-08-13

wow!!! one thing how long did it take

trollface34 (author)2014-08-13

wow!!! one thing how long did it take

maroone1 (author)2014-07-25

Fantastic tutorial. I'm actually going to rebuild it and on the photo with the 3D Printer Parts I can see 5 printed parts, but there are 4 STLs. Is there a STL missing, or do I have to print out a pice twice? Thanks.

BrittLiv (author)maroone12014-07-29

Damn, I totally forgot... Madnesz has asked me for it, too. I can't find
it anywhere and have to redesign it. I will do so this weekend. What
type of printer do you have? I could give you the .x3g file.

maroone1 (author)BrittLiv2014-08-03

Unfortunately not a MakerBot. The Printer asks for .stl files. But I can give it a try to convert the .x3g to .stl

Thanks a lot.

BrittLiv (author)maroone12014-08-03

I've uploaded it. I hope it fits. Else please get back to me.

maroone1 (author)BrittLiv2014-08-04

Great, thank you! ^_^

Darthorso (author)2014-06-08

Congratulations Britt, your creation is amazing! I love the look, it's perfectly Borderlands-esque :D

The triple barrel gives an original and unique look to the guns, I hope I can have acess to a 3D printer... they're very rare here in Italy, even for customer-service. You can find 3D printers only in large industries that won't make you a single piece... :(

I've made an instructables (my 1st one) about Nerf Strongarm, it's an aesthetic mod. Take a look and tell me what you think about it!

Thanks and congrats again! :)

craftclarity (author)Darthorso2014-07-10

Eyyyyy Darthorso my friend!

I'm not sure if they ship to Italy, but they'll definitely print a single object for you....
Looks like they've been to a few makerspaces there.

Darthorso (author)craftclarity2014-07-10

Eyyy craft! :D How are you my friend? ^_^

Thank you a lot for your suggestione! But in these days I've found a friend of mine who own a little 3d printer and can do something for me! :D :D :D

But you are a true friend for giving me that web link! :) Thank you again, stay great! :D

craftclarity (author)Darthorso2014-07-10

Very well, sir, very well indeed.

Glad to help! I'm always doing my best to connect people to resources... :)


About This Instructable




Bio: Hi, my name is Britt Michelsen, I'm a Chemical Engineer especially interested in Computational Fluid Dynamics. To balance all the theoretical work I like ... More »
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