K'NERF Assault Rifle




About: This is my second account here on instructables, my previous one is TheAwesomestDude. I hope you like what you see :)

My entry to the Toy Rods & Connectors Contest is based on my two favorite childhood toys. Nerf has always been one of my childhood passions, as well as K'nex. Me and my cousins would always have an annual Nerf war. Ever since I got my first K'nex set, I have strived to innovate and engineer new creations. I see lots of K'nex projects and a lot of Nerf projects here at Instructables. So I decided to combine the two. Out of which has come my newest project, the K'nerf Assault Rifle. I use the term K'nerf to describe a KNEx & NERf combination. Out of my appreciation for the building of K'nex weapons, I decided to have the base of my K'nerf project to be K'nex. And I would design a system to incorporate Nerf attachments to my K'nex gun. One of my reasons for making such a thing, is that K'nex is wonderful to build with and Nerf already has premade attachments, ready to be used. They have numerous sights, scopes, grips, lights, and many other attachments. Another reason to build a K'nerf gun, is combining two already awesome toys into an epic combination. So, without further ado, here is the statistical analysis of my K'nerf gun:


Modified Picatinny Rail adapted to hold Nerf Attachments (Courtesy of TheDunkis)

Modified Extension Stock (Courtesy of TheAwesomestDude)

Holds up to three NERF Attachments

Shoots 55ft-65ft

Small Caliber Round (Green Rod)

Holds Twenty+ Rounds

Removable Magazine

Small Place for K'nex attachments

Lightweight & Maneuverable

Great Instructions, with image notes on each image
Please Vote for me in the Contest if you like my Instructable!

Step 1: Piece List

For your convenience, I have attached a piece list to let you know what you need to have in order to create this K'nerf creation. I have found it easier to make a creation if you already have all the pieces gathered instead of hunting them down later. (Pictured above Are broken parts that you will need)

Piece List:1027










Gray(1 slot):58

Gray/Speckled Gray(2 slots):7








Y-rod/Black hand:28

Blue Spacer:10

Tan Clip:4

Blue Clip:21

Broken White Rod:8

Broken Blue Rod:1-2


Broken Orange Connector:3

Make Sure to Read All Image Notes, There are notes on EVERY Picture!

Step 2: Adjustable Stock

In this step you will build the back portion of the gun, a heavily modified stock borrowed from TheAwesomestDude. Please follow all image notes carefully. Feel free to ask for help if you need it. An attached photo and description of your problem would be great!

Step 3: Main Body of the Gun (Mech Box)

To have a workable weapon you must of course include the Mech Box or it will not function correctly. This is the most crucial part of any build. So with that warning please follow all image notes, or don't (but it will suck if you don't). Feel free to ask for help if you need it. An attached photo and description of your problem would greatly appreciated!

Step 4: Fake Barrel

Title tells it like it is, this is the step where you, the builder, make a fake barrel to look cool. The fake barrel has no other purpose than looking good and attaching attachments. All it is is a big box of air for the ammunition to fly through. And as always follow the image notes, or you will lose your way and end up with something not quite right. Feel free to ask for help if you need it. An attached photo and description of your problem would be greatly appreciated!

Step 5: Assembly!

Yay!!!! You're almost finished! Now we can attach the big chunks that we have been building throughout the instructable. Please follow all image notes(you could screw something big up if you don't). Feel free to ask for help if you need it. An attached photo and description of your problem would be greatly appreciated!

Step 6: Adding Panels(Optional)

While this step is entirely unnecessary, it makes you gun look badass. 'Nough said. Please follow all image notes. Feel free to ask for help if you need it. An attached photo and description of your problem would be greatly appreciated!

Step 7: Magazine/Clip

The thing that gets the ammunition to the chamber. Build it. This is one of the hardest parts of the gun to keep together while building. Please follow all image notes, trust me, you will probably need to. Feel free to ask for help if you need it. An attached photo and description of your problem would be greatly appreciated!

Step 8: Ramrod & Other Assorted Tips and Tricks

Well, you've made it. This the end. "Dramatic music playing in background". Well, I hope you enjoy your new favorite toy combination. Have fun with you K'nerf Assault Rifle. Time to Accessorize! Don't forget to look at image notes! Feel free to ask for help if you need it. An attached photo of you problem would be greatly appreciated!



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    54 Discussions


    4 years ago on Introduction

    Whoever got this featured THANK YOU!!!!!


    3 months ago

    Holy moly! That’s impressive! I would love to build this but I don’t think I have enough pieces. Btw, is that you holding the gun in the pics?

    4 replies

    Reply 3 months ago

    Haha, yeah, that was me 4 years ago lol. Thanks. I honestly wouldn’t recommend building this, from my recollection it wasn’t all that good or as good as I made it sound. I don’t get on much or mess with knex much anymore but I have one gun I’m still tinkering around with, I posted a preview of it about a year ago, never any actual pictures of it though. I’ve re-designed its internals about 5 times and I’m not really happy with any of them. Who knows, I might post it one of these days. Also currently have a truck + trailer built out of knex, might post that, idk.


    Reply 3 months ago

    Nice. The gun looks good. U should build an mp7


    Reply 3 months ago

    Interesting. Just from my recollection I think Red made a dope one, but after looking, he didn't explicitly make an mp7. However, he made the MSMC V.2, that's probably the closest thing you will find on instructables right now. At the moment I don't have enough pieces or time to create a whole new gun right now. The gun + attachments I am currently working on consumes a ton of pieces and is really all I want to spend my effort on at the moment, trying to make a dope gun + instructions for the plastics contest. Super hyped about that. After that, who knows, I might keep knexing, I might not, I haven't truly built a new gun in two years.


    Reply 3 months ago

    Found some pictures of an unposted gun sitting in a folder on my computer, I’d recommend that gun over this anyday, but even still, the gun I just posted has a ton of room for improvement in most all areas except trigger and firing system. It’s a solid gun, it shoots nice, unfortunately no step by step instructions though, but it should be buildable with the pictures and image notes I put up.


    3 years ago

    Is it possible to leave out some layers. because I dont have enough pieces for it.

    1 reply
    The Knex Inventor

    2 years ago

    Awesome gun! I love the idea of combining two different elements into one gun, in this case, K'NEX and Nerf.

    2 replies

    love this here rifle. great for shooting at my neighbors. god bless america, god bless this here gun thingy rifle shooter. you officially have the official approval of the redneckiest redneck, BillyBob Jones Junior.


    4 years ago on Introduction

    awesome project man, i really like how you implemented nerf accessrories with the custom picatinny rail. both are passions for me too!!

    2 replies