Introduction: KNEX CROSSBOW



A simple knex crossbow that uses few pieces. Many different types of ammo and modifications. Includes Flighted Crossbow Bolt simmilar to the sniper round but I did not copy KILLERK! I made it when I was 10.

Length=40 Cm Height 16 Cm

Step 1: Collecting the Materials and Constructing the Crossbow

Picture of Collecting the Materials and Constructing the Crossbow



6 green
2 white
4 red
4 blue
2 grey

4 yellow
2 orange
6 red
2 white
1 grey
4 light grey
2 green
2 brown

1 medium strengh rubber band
3-5 smaller rubber bands

Follow the steps through the pictures

Step 2: Stringing the Crossbow

Picture of Stringing the Crossbow

Follow the pictures to string the crossbow.

Add extra rubberbands to the trigger if the bow rubberband is too strong.

The trigger rubberbands will counter act the bow rubberbands.

Step 3: Constructing Crossbow Bolt

Picture of Constructing Crossbow Bolt


1 red
1 green
1 orange
1 black socket
1 grey


Construct the rod then tape on the paper fletching at both ends and back. The fletching size depends on the power of the crossbow. Keep testing it until it is good.

Step 4: Firing and Loading the Crossbow

Picture of Firing and Loading the Crossbow

Take the rubber band and wrap it around the two green connectors and put in the bolt. Press the trigger and shoot. Range depends on rubberbands and ammo. You can also shoot other ammo types like grey connectors.

This crossbow is only the basic form. You can make it smaller and also make it shoot two bolts at a time.

The bolt keeps falling out:
Put some grippy tape in the trigger area.

The Rubber band keeps jamming into the gap between the yellow and green connectors at trigger:
Also use tape, but use smooth tape.

This is my first instructable, tell me if it is good!



knex boy (author)2007-05-11

how do i get a pic thing?

DrWeird117 (author)knex boy2008-07-07

u have one! : )

meat grinder (author)DrWeird1172009-06-10

he posted that a year ago

and you replied a year after

now it is a year later i will reply

DrWeird117 (author)meat grinder2009-06-10

Whoops. You saw nothing. Got it?

meat grinder (author)DrWeird1172012-06-14

now i reply a year after AGAIN

paulm (author)knex boy2007-06-04

i don't quite understand. What is the appeal of these knex weapons? why not create a wonderful weapon out of somthing other than plastic? im working on a nice scale crossbow instructable made of wood that is 1m by 1m completed

bakenbitz (author)paulm2007-08-30

knex is an easy building toy that many people have and doesnt require tools to make it

That is correct. If you can imagine it, you can build it!

neoplayer2 (author)paulm2007-11-23

Because K'Nex are easy to build, easy to repair, easy to find, don't take long to make, and are a WHOLE LOT of FUN! They give you a sense of accomplishment when you make one and it works great. A lot more fun than boring old WOOD! lol

Undead Necromancer (author)2006-12-16

I don't get it. What do you do at the last stage when you wrap the rubber band round the green stuff. Whats supposed to happen? What rubber band do you use and where does it go?

do u play guild wars or world of war craft

I play guild wars....

guild wars is AWESOME!!

foxtrot4697 (author)D-Style2008-08-25

i like wow gameplay better but guild wars is pretty sweet

get a life (on runescape)

Zelda games are the Chuck Norris of all media.

Timesplitters 2 is the god of all first person shooters.
(along with the original Goldeneye)

killa696 (author)D-Style2008-11-30

Its one of those games where you can play for a week and i gets boring like runescape... buy a REAL game like Half-life 2 or GTA IV

dude, you pull the trigger which sends the bolt flying into the unfourunate target

superdood (author)superdood2008-09-12

*unfortunate* sorry 'bout that =)

phillyrocks (author)2010-08-11

Where are the 2 red rods going to on the trigger?

knexsuperbuilderfreak (author)2010-08-07

hate to say it but its NOT the first cross bow on this site a crossbow was posted in november and this in december. link to the real first crossbow:

KnexFreek (author)2009-10-18

5stars cause its a first

actually its the 2nd

Fred the evil puppet (author)2010-08-02

im 10. i made a pistol sized crossbow and it shoots 50 ft with 2 bands.

171292 (author)2010-02-11

The instructions for the trigger aren't clear enough.  PLEASE TAKE SOME MORE PICS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

171292 (author)2010-02-11

Dude, you need 3 grey rods on the firing track.

Lostkid (author)2007-02-01

this is a fun crossbow. I really like it. I haven't made the special ammo for it butit works fine if u use a grey rod with agrey cap at the point and an orange double sided at the back. OVERALL:GOOD GUN PS i took the red rod off the bottom of the front. i think it looks a wee bit cooler but watever.

meat grinder (author)Lostkid2009-06-10

put an orange on the front and it can put a hole in paper thats strectched tight.or sharpen the rod

meat grinder (author)2009-06-10

use 3 grey connectors

fib3roptix (author)2009-04-12

Im going to make a sub-compact CAR submachine gun from this model ( dont worry I will put Hobo lord in my credits)

Wafflicious (author)2008-12-09

this isnt really so much as a crossbow ... its kind of like a pistol bow....... any ways nice job 4/5 because its sooooo easy

The Jamalam (author)2008-09-27

so this was the 1st crossbow! looks good

thedog458 (author)2008-09-10

plz will someone make a small wrist crossbow iv wanted 1 for a while now but no ones made 1 and i have no clue how grrrrr so plz can you make 1 mr hobo lordon?

Moloro0 (author)2006-12-03
Check out this k'ex gun forum. Its not done but sign up and post your creations.

therandomperson (author)Moloro02008-07-30

thats not a very good website

eheeohoo27 (author)2008-07-09

extremely primitive bow, but it works xd

toolman883 (author)2008-07-07

i added a stabilazer using 2 reds rods awhite rod and a blue snap connector

instructable doggie (author)2008-06-20


freakinslop (author)2008-05-11

takes the instruct out of instructable

tytnium (author)2007-01-17

If you want to shoot smaller ammo, it works better if the bottom of the barrel is a row of orange connectors instead of the gray rod. It gets rids of the bumps between the gray rod and the connectors.

hobo lord (author)2006-12-24

The last stage is when you put the rubberbands over the green nobs, it will not release but may move a bit forward, then you load a bolt and click the trigger.

fobblewabble (author)2006-12-03

It has a little lack in instructions for making the parts but i think everyone here could manage to build this.

Danny (author)fobblewabble2006-12-07

no its pretty darn hard to follow especially as there is no instructions just please if you can post instructions! oh btw i managed to make it with difficulty

hobo lord (author)2006-12-04

It shoots 50-75 feet with the new bolt.

hobo lord (author)2006-12-04

you want authentic, I have one right now and it is more powerful than the first but it bends grey pieces. Ill get the picture soon

crestind (author)2006-12-04

Authentic! It's very cool as it doesn't utilize the traditional "barrel" as it uses a track. Very unique design! Could you make a second-generation version that looks even more like a crossbow with the rubber band attached to the top? You could also strengthen it to allow stronger rubber bands.

Knex Lego Maniac (author)2006-12-03

not bad its cool seeing all the different designs of weapons people make out of knex

About This Instructable




Bio: Knex guns rule It was cool to be around when the first guns came out Now, after not having building knex for so long, its ... More »
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