Introduction: Knex Slide Action Pistol

Picture of Knex Slide Action Pistol

A long time ago In a distant bedroom, far, far away I made a slide action pistol but I had a problem with the slide falling off, and then one night I got a huge load of knex, I found the original magazine and then VOILA! this was born.
It is a slide action gun meaning that you pull the slide backwards to cock the firing pin and then the slide returns to its place. The handle is also the magazine to make it more ergonomically friendly. However this and the barrel being wider than each rod does mean that unfortunately it is prone to jamming.

Step 1: Slide

Picture of Slide

1. Make two of these; the connectors have to face the same way as in the picture.
2. Also make 2.
3. You will only need one of these sections as it goes in the centre.

4&5. Now to assemble it, take 5 blue rods and slide them through the holes in the connectors.(note the directions of the connectors. Then slip 10 blue spacers on the ends of the rods.
6&7. Clip the two panels on the blue rods as shown.

8. Make 2 of these.
9. Clip the rods onto the black hand connectors.

10. Make 1 of these.
11. Make 1 of these too.
12&13. Clip 2 Black hand connectors on.
14&15. Fix the two together as shown.
16&17. Attach them to the rest of the slide by clipping the blue rod into the blue connector

The slide is finished.

Step 2: The Barrel and the Firing Pin

Picture of The Barrel and the Firing Pin

1. Make 2 of these.
2. Attach 6 white rods as shown.
3. Make 1 of these.
4. Make 1 of these.

5. Slip these over the white rods.
6. Now clip on the other side of the barrel as in the picture.

Slide guide.
7. Make 2 of these.
8. Attach them to the barrel.

Firing pin.
9. This is very simple, just take a red rod and clip a ball socket on the end and a tan connector to keep it stable.

Step 3: The Handle and Trigger

Picture of The Handle and Trigger

1. Make 2 (this is the side of the handle)
2. Make 1.
3. Make 1 of these too.
4. Clip 2 white rods on the bottom of the panel.
5. Attach the strips of connectors onto each white rod as shown.
6. Now clip the other side on.

7. Make 2 of these.
8. 1 of these.
9&10. Take a white rod and clip it to the red connector and slip it through the dark grey connector's hole.
11. Clip on the other red connector.
12. Now slip another white rod through the holes of the 2 red connectors and attach it to the yellow connector.

Magazine pusher
13. Make this as shown.

Step 4: Assembly

Picture of Assembly

1. A view of how it fits together.
2. Clip the rods on the handle to the white connectors and slip the rod on the tan connector into the white connector.
3&4. Slide black hand of the trigger and the blue clip up into the barrel.
5. Take the slide and place it ontop of the slide guide and the put the slide rails over the barrel's rods as shown.
6. Slide the firing pin through the red connector's holes and into the barrel assembly.

Step 5: Rubber Bands

Picture of Rubber Bands

1. Magazine pusher- stretch and then attach a small rubber band from the yellow connector to the handle's white rod.

2. Trigger- Loop a small band around the white rod on the barrel and then weave it inbetween the trigger's connectors.

3. Slide- Loop a medium band around the foresight and the blue rod then hook it over the orange connector on the barrel.

4. Firing pin- Hook a medium/large rubber band over the ball socket and around the white connector on the barrel.

The pistol is finished!

Step 6: Loading and Firing

Picture of Loading and Firing

To load the gun simply pull out the magazine pusher and slot grey connectors attached to green rods in to the handle so that they a parallel to the barrel as in the picture.

To cock the gun grip the top of the slide, press down slightly and pull the slide all the way back. Then release the slide and it should return to its previous place.


teddyman123 (author)2015-08-18

This is so cool!!!!!!!!!!!!!!!

slithien (author)2010-11-16

Ive been waiting so very long for a slide action pistol with a mag in the handle to come!!! Ill build it now and write some good poinys and bad points a little later.

Triggerhappy101 (author)slithien2013-11-12

I'm working on one with slide removable mag ind i might put safety on it too

freeza239 (author)2011-02-21

this gun sucks

~Meme~ (author)freeza2392012-10-06


SomeAsianKid (author)freeza2392011-06-14

like your mother O_O its a p good gun i havent started to make it yet but you can tell its a good gun

aallison1997 (author)2012-07-28

Mag jams really easily, shame because it's a really nice concept.

The only way you could know that is if you had tried it.

dude awsome gun i subbed ya good work

superbestknex (author)2011-04-25

no it doesnt

xieandy18 (author)2011-03-18

1. What does it shoot?
2. Do you really have to use a broken "Y" clip?

Fred the evil puppet (author)2011-02-06

Does the mag have to be slanted?

Yes, otherwise the ammo won't fit.

Trebor__24 (author)2010-09-05

black hand???

ruben2597 (author)Trebor__242011-01-31

y clip

PiTBuLL892 (author)2009-09-26

the red rod on the firing pin isnt big enough to get the bullet out of the barrel while a grey rod is to big to be cocked by the slide. what do i do??

Extend the front as in the pictures on the allsteps page.

??? im not a pro member and i cant use all steps page. what do u mean by extend the front like how?

plz awnser.

Like this.

flyerminer (author)flyerminer2011-01-17

oh and my bullets dont come out and when they do they only shoot 5 feet.

slithien (author)2010-11-17

I finished it today, it took about 3 hours in total to build and get working. Good points: its a awesome gun once you get it working and put a few bands on to build up the power, its powerful, the slide works perfectly and never falls off, it doesnt take to long to unjam.
Bad points: the magazing can mess up (i had to do a lot of work to find out why it wasnt working my edits to the mag were: 1.above the trigger there is a small blue clip take it off and move it to the over sode of the mag. 2.on the pusher make the elastic band realy loose inso it only justs pushes the ammo up. 3. I changed the ammo to white rods because they dont get stuck half way down the barrol. 4.move the gun inso mag is in a straight horizontel position and then tape in a green rod through bboth of the middle yellow connectors. 5.dont load over 4white rods), the trigger can turn aroung and gets annoying(to fix this change the grey connectors for two white rods), the sights are a little to high.

radioactive-potato (author)2010-06-27


james4 (author)2010-03-01

when things don't work i get mad at the person that makes it      :'(  
:'( >:(

vinno93 (author)2009-11-30

is it really not a good pistol

techman26 (author)vinno932010-01-29

yes it is its amazing i love iy

freerunnin1 (author)2009-11-28

 yeah i made a good slide action pistol from your slider and Big z's pistol, it shoots well and is reliable. seen as your pistol jams often i used his firing mechanism and ammo, the shape of the top of his gun is similar to yours so i just added your slider and slider guides, :P works well btw you've got the best slide action mechanism ive seen so far. the grey clips are the bullets and the blue bits are alternate ammo. this is what it looks like:

freerunnin1 (author)freerunnin12009-11-28

 it wont upload the picture for some reason :S

imthatguy1125 (author)2009-10-30

this gun never shoots if there is more than 1 rod in the mad but i like the slide

PiTBuLL892 (author)2009-09-26

so what your saying is we dont need to break it???


brandeno1997 (author)2009-09-19

I have made this knex gun so i has really good range and good aiming but when i built this gun the trigger didnt work

knexjay (author)2009-09-12

perfect instructions nice!

AzNaLaNo (author)2009-04-15

isnt this like DSman's side arm's mag and trigger

No Dsman's is like mine without the slide.

knex_mepalm (author)AzNaLaNo2009-06-29

You play ms?

AzNaLaNo (author)knex_mepalm2009-07-01

hell ya

knex_mepalm (author)AzNaLaNo2009-07-04

Is it mapleglobal? cause i'm using WhiteBishop0 since my pro got hacked. wah F7

AzNaLaNo (author)knex_mepalm2009-07-27


knex_mepalm (author)AzNaLaNo2009-08-08

Whitebishop0 got banned for no reason now, cant get it back, new character now, seen the cks?

psharpep (author)AzNaLaNo2009-04-18

Actually DSman used this guy's design.

novakfor3 (author)2009-09-06

Great gun, nice write up, 4/5! In the picture, you can see I moded my gun. 1. On the slide, I added several parts for strength. 2. I took out the magazine pusher, I was having trouble with that, it kept on jamming the slide. 3. That grey rod I put by the trigger? Well, sometimes I pressed the trigger to hard and it would pop out, now it can't come out. 4. Put on rubber bands several different ways. This gun in my opinion is more for looks and not strength. I love the slide action thought, it doesn't jam at all and I can slide it easily.

AliGame (author)2009-07-22

Good one, I built it. But the magazine doesn't work :( I'm loading the rods in the front part of the thing currently. But I really would like the magazine to work.

bean dip (author)2009-07-13

Thanks.I like this gun its pretty good.

bean dip (author)2009-07-13

I couldn't get the magnazine to work .So I'm messing around with it. I might of did something wrong.

Look at the pictures in the comments below, good luck with it.

planktons1 (author)2009-03-21

Which set of knex has the black hands? I need them x_x

chopstx (author)planktons12009-07-10

you can always go on and buy them.

Well most of them used to have them but I'm not sure about now, your best bet is ebay - you can get K'nex a deal cheaper than straight from K'nex but it is used.

RESTRICTED (author)2009-05-30

I built this gun and it works fairly well. The only problem that i see with it is that it isnt very reliable, sturdy, or the most easy gun to operate. I really like this gun nonetheless, maybe some quick and easy mods could fix these problems. I love the idea of loading through the handle because it makes it feel more like a real pistol. Very innovative Loose, keep up the good work!

Thank you. Did you try the mods in the pictures I have in the earlier comments.

About This Instructable




Bio: I'm in my final year of Product Design at uni so I don't have as much time for tinkering as I'd like ... More »
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