This is the ultimate guide to K'nex Guns.  In mikeasaurus's words: 

"There's very basic K'NEX guns, and some very advanced ones; but I don't see any documentation explaining how they work. You pro gun-builders are on another level and maybe take these complexities for granted. I'd love to see a detailed Step-by-Step that covers triggers, magazines, reloading, firing mechanism, bi/tripods, elastic types, and all other manner of accessories."

This is that guide.  I hope that you'll find what you're looking for here, and once new discoveries are made, or if I forget something, I will add more.

The contents include:
I. Methods of Firing and Types of Ammunition

A. Firing Pin Guns: Part One: The Basics
1. Single Shots
2. Magazines

B. Firing Pins: Part Two: Beyond The Basics
1. Tubular Magazines
2. Bolt Actions
3. Turrets

C. Single Shot Slingshots
1. Ratchet
2. SRV2

D. Rail Guns
1. How They Work
2. Turrets and Mags

E. Ammunition Types
1. Oodammo
2. Finammo
3. Rod Ammo
4. Connector Ammo
5. Special Ammo

II. Types of Triggers
1. Hinge Trigger
2. Gear Trigger
3. Sliding Trigger
4. Roundabout Trigger
5. Disclaimer

III. Reloading

A. Oodammo Pistols
1. Removable Mags
2. Flip Mags
3. Sliding Mags

B. Regular Magazines
1. Friction Locked Mags
2. Clip On Mags

C. Turrets
1. Regular Turret Reload
2. Ratchet System

IV. Accessories
A. Bolts
B. Bi-pods
C. Sights
D. Scopes

Intro picture credit goes to SLDxRaPiiDZz.

Step 1: Firing Pin Guns: Part One: the Basics

This is Part One of Firing Pin Guns.  This is, by far, the most popular mechanism of K'nexers.  I feel like this and part two are going to be some of the most important parts to this guide, so read carefully.  I hope you find what you need here and good luck!

1. Single Shots: A single shot, in K'nex, is the most basic pin gun.  The single shot pictured here is KILLERK's original K'nex pistol: a staple throughout the K'nex gun community.

How it works: A firing pin is pulled forward by rubber bands.  It requires you, the user, to pull it back until is stuck behind a trigger, which is usually pulled by more rubber bands in some fashion.  You then load a bullet into the barrel; if your single shot is exceptionally well built, it will have a bullet lock, which keeps the bullet in the barrel.  

Once the trigger is pulled, the firing pin is unstuck, and the firing pin flies forward and rams into the bullet.  The bullet, because physics tells it to, will fly out of the barrel and hit something, hopefully, at what you were aiming for.

2. Magazines: A K'nex gun with a magazine of some kind is one of the most built K'nex guns on Instructables.   Shown here (the second picture; the numbers match up with the order of pictures) is KILLERK's basic magazined pistol (It is the last gun in the slideshow).  As we will learn later, that magazine is a clip-on, removable magazine.

How it works:  Remember the single shot concept?  You should read through that again.  Did you?  Ok, good.  Now, a magazine is being added.  So now, when you pull the pin back, it will slide past a bullet in a magazine, and the bullet will be pushed into the chamber by rubber bands.  Now, continue to pull it back past the trigger, and now you've got yourself a shot to fire.  Just keep pulling the pin back, and bullets will keep being pushed into the magazine, giving you a much faster reload time than a single shot.

<p>WOW!! you must have a lot of spare time!!!</p><p>That is soo fun. I remember making guns with K'nex.</p><p>Do you make a living by doing this?? </p>
<p>This will help a lot</p>
<p>I don't like to cut knex pieces for a build, but a lot of the best guns out there ask me to do it! Maybe i'm to attached to my k'nex? :)</p>
U have an amazing Knex arsenal based off the pics. I barely had enough to squeeze out one gun.
<p>There are some guns on the site that use little to no parts. I understand that dilemma, though; many people have it.</p>
<p>how would I get enough parts for all of this stuff?</p>
<p>Well, the most cost efficient way is to get them via resale: garage sales, eBay, amazon, etc. People generally sell them by the tub-full so it's a good way to get parts fast.</p>
<p>where do you get the K'nex? I've never had any and i want some to build guns </p>
<p>I'd recommend garage sales, resale stores, and eBay, amazon, etc.</p>
<p>dense guns be cool</p>
And im talking about the trigger blocking the pin trigger set-up
For the gun that you pull back the pin and have the trigger lock it into place, how will the pin stay there when the pin is pushing forward on the lock? And plus the trigger will be moving back on its own without you touching it, thus firing by itself. (Hope that made sense!)
Omg it seams so simple to make a single shot but so confusing at the same time!!
<p>Try out Killerk's original pistol for a start, although it does have a block trigger. Some of my pistols, like 'DOT' and 'Jux,' could work too, as well as the 'NAR' and a few other things. I don't think the NAR can be found anymore, unfortunately. The others are either on my profile or somewhere in the vast land of instructables. After you get acquainted with how those all work, then it may become easier to design your own single shot after realizing how the mechanics and construction of those said guns work. Good luck, friend!</p>
I would like to thank you for using but gun but mine is not friction locked look back into my instructible and you will see a green rod sticks into the mag (a new design )
You're welcome. I think the green rid sticking into the mag creates friction, locking it in, though; it's just a more complex friction lock. Please correct me if I'm wrong, and I can change it.
No it does not create friction it locks into a hole in the mag
I know! I'll put yours in as a special type of removable mag and then get another example for friction lock. Thanks! I'll get around to it eventually. :3
**cough cough** ummmm how long is eventually? **cough cough**
Obviously quite a while.&nbsp;<sup>I kind of forgot about it; sorry. &nbsp;<strike>I'll have to force myself to do it eventually. </strike></sup><sub>&nbsp;</sub><br>
It's ok ;( ;)
You're feeling both happy and sad, I see. :P
Im teasing BTW
Oh ok
Thanks; I'm glad you like it. :P
Wow, what a great instructable! As an outsider to the K'nex community on Instructables, it's really great to see such a comprehensive (and comprehensible) explanation of the basic and not-so-basics of K'nex guns.
Thank you! It's great to know that you've learned from this guide; that's what it is here for. Is there anything that you didn't understand, or think should be changed in this guide? I'm curious. :P
Nah, it was pretty clear! Without any K'nex on hand to play around with and test stuff out, I think you did a great job.
Thanks! :D
Congratulations for being selected as a finalist in the Toy Rods and Connectors Contest!
Thanks! I wish you the best of luck, too! :D
Cool your awesome DarkOwlKnex
Thanks! :3
"Additional informations?" Bad grammar. >:C <br/><br/>Lol just kidding!
:O Is there a typo? I shall fix it immediately!
:):(:):(:):(:):(:):(:):(:):(:):(:):(:):(:):(:):(:):(:): do you know what that is? Take a guess.
A happy-sad-happy-sad-happy, awwwwwwwwwww, forget this. It's a really bipolar, confused, overly emotional face.
Its a happy-sad-sad-happy-happy-sad-sad-happy-happy-sad-sad-happy-happy-sad-sad -happy-happy-sad-sad -happy-happy-sad-sad -happy-happy-sad-sad -happy-happy-sad-sad -happy-happy-sad-sad -happy-happy-sad-sad -happy-happy-sad-sad -happy-happy-sad-sad -happy-happy-sad-sad -happy-happy-sad-sad-happy-happy-sad face!!!
Impressive. But can you tell why kids love the taste of cinnamon toast crunch? I doubt it.
Because it tastes like crunchy cinnabbon... P:
No. Just kidding. :3 That's pretty much it.
Awesome guide man, you really put some time into it :p. Thanks for using some of my guns as examples.
Thanks, and you're welcome; a lot of your guns were perfect examples for what I needed. &gt;:D
Thx man
You're welcome. Did you find what you needed here?

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Bio: Hello, my name is Ondrew. My main interests all lie in design: from mechanical to digital to sound to graphic to... Past me finds it ... More »
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