Introduction: K'Nex Crossbow

Picture of K'Nex Crossbow

K'Nex crossbow

its got power, and range. i don't have averages yet but the last version shot 20 feet and has some power. this version has good power and can pierce cardboard with a good shot from app. 5 feet away. not bad.

the reason i am posting this is to show a new idea i had for removable parts. the only removable part i have for it right now is the head rest, but i am hoping for people to make other removable parts for it.

this gun has a ratchet system on it. so it can take a lot of power from rubber bands.

the gun also has a ammo holder that goes into your pocket. you can see a picture of me holding the crossbow with the ammo holder in my pocket(yes it is me(yes i blocked out everything else)).

it is pretty easy to make, so i made it with the metal K'Nex pieces because i though it would be cool.

Step 1: Barrel

Picture of Barrel

easy enough, just make from the pictures. its a track that the bolt travels on. nothing new.

Step 2: Ratchet System

Picture of Ratchet System

the ratchet system. again, nothing to new here. making it from the pictures should be easy enough.

Step 3: Addons to Barrel and Bow

Picture of Addons to Barrel and Bow

can't have a crossbow with out a bow. again nothing new. just make from the pictures.

Step 4: Renforce the Barrel and Handle

Picture of Renforce the Barrel and Handle

just more add ons to the barrel and the handle. make from the pictures.

Step 5: Stock

Picture of Stock

again easy. make from the pictures. it is 3 layers thick. look at the notes for some help if you don't get it.

Step 6: Head Rest Add On.

Picture of Head Rest Add On.

make from the pictures.

Step 7: Firing and Damage and Bolts

Picture of Firing and Damage and Bolts
ok, well this is were i tell you how to fire it and make the projectiles and the damage it makes.

  • load a bolt
  • pull bow back and hook it into white connector
  • pull trigger
  • repeat

O i don't have pictures for the rubber band placement but put a small one on the trigger and two #64 rubber bands tided together for the bow.

Step 8: Extras

Picture of Extras

just the ammo holder.

well thats it for the instructable, i hope you like it.

please comment (all spam will be removed) and rate! :-)

Step 9: All My Other K'Nex Things.


EliteTrooper (author)2014-10-18

Excellent weapon. Although it looks small, it is extremely powerful. However, I would have to rate it 9/10, due to the iffy trigger. But overall, good job!

Kona-chan (author)2013-04-26

love it!!

Fred the evil puppet (author)2010-07-28

cool! say yes if you recommend this gun.

yes :P



yes :)


oblina (author)2012-02-21

4 words. Best knex crossbow EVER!!!!!!!

kmanv3 (author)2010-07-03

my fingers hurt

oblina (author)kmanv32012-02-19

mine too

Dashadower (author)2011-11-14

god bless u

starwarsjedi76 (author)2011-08-15

i put the stock a little bigger and i might just take off where the rubber bands go on and make the barrel longer & make it into a sniper rifle ( mabye)

sniper_lover (author)2011-05-15

haha, looks great!! but is the front of the crossbow not a little bit weak??

it should good to be modelcrossbow

ol987986 (author)2011-03-13

urrm isnt the bow a little bit weak? i mean if u put a couple of bands on it wud probly snap off??

no it wont, i built this bow about a year ago and i have still got it, its one of my favourite weapons and ive managed to fit over 15 extra rubber bands onto it aswell as the main bow and god does it pack a punch, it can absolutely destroy about 3 coke cans in a row from about 10ft using a sharpened rod

jgreenwood (author)2011-04-26

i built this and upgraded it wit: scope, bigger back, and grip

anaconda (author)2008-11-17

i can't tell in pic 11 if thats 3 layers or two layers. please respond

ol987986 (author)anaconda2011-03-13

:O 3 years l8 :D but its 3 layers

anaconda (author)anaconda2008-11-17

never mind.

land o cows (author)2008-06-15

white rod conected to green connector wont move, it is wedged between the orange connector and the white spinning connector. i have the pieces correct and the red connectors attached to the blue rods are in.what did i do wrong or is this how a rachet works? i know rachets only move one way, wont move either way. plz help ty

ol987986 (author)land o cows2011-03-12

dude you've connected it on the wrong end of the barrel or used too many orange conectors :)

dsman195276 (author)land o cows2008-06-19

O i get it. make sure that the white rod is ON TOP of the white connector. i am guessing that you have it under the white connector, which will make it not be able to move.

dsman195276 (author)land o cows2008-06-19

let me look into your problem and get back to you on that. i assure you that my ratchet does work.

bighead5454 (author)2011-03-07

a few months ago i modded this to shoot some small crossbow bolts
can't injure, but hurts if you get shot+

zachtorch (author)2011-01-24

I loved this, but while I was messing around, the arms broke repeatedly, also, could you add some pictures of how the rubber bands are positioned? It was really hard for me to figure out how to place the rubber band on the trigger without it breaking.. Great job on the crossbow

ccobra (author)2011-01-20

its a cool gun lolz

the shandy man (author)2010-09-03

not made it yet but looks cool... not :) jokes it looks cool so the shandyman will make it.

novakfor3 (author)2010-09-01

Nice gun. Like IAC's striker pistol.

bartluke (author)2010-07-24

great gun!!

dsman195276 (author)bartluke2010-07-24

Thanks! :-)

danbaha (author)2010-07-16

This was my first gun I built. nice job! 4*

dsman195276 (author)danbaha2010-07-19

Thanks, I'm always glad to be of some inspiration :D

H1T4TCH1 (author)2010-07-14

hahaha i shooted with a heavily modified sipriani v2 onto a tiny little box in front of the front door. now there are tiny little dents in the door ;) i took it apart now and my dad still didn't detect the little dents ;)

StarkIndustries (author)2010-07-08

i like how the box says goal setting lol.

prodo123 (author)2010-05-27

That's strong? :P

mettaurlover (author)2010-02-22

It's not really that complicated. I just grab a large handful of each piece type and get building. If I need more, I just go and get another handful.

KnexFreek (author)2009-12-15

 UHMMMMM metal knex?
WAT?? ?? ?? ?? ?? 

matrix828 (author)KnexFreek2010-02-22

i think he means the grey-ish colour knex.
hope i helped :)

mettaurlover (author)2010-02-21

If you need a parts list to build this, you shouldn't be k'nexing.

knex luver123 (author)2010-01-07

i made it have a magazine, with multiple ribber bands, semi auto!!!!!!

2001572 (author)2009-11-15

 Cool holder.

2001572 (author)2009-11-15

 So this is it,
very cool!
I've built my own mass k'nex gun/bow.
Man, it took ages, but it's very very good.
Although your photo's are some bad-positioned,
good job.
I'll see your other guns too.

2001572 (author)2009-11-15

 In the first pic, pls. change the yellow boxes(notifications) into smaller ones.
They take the view away.

2001572 (author)2009-11-15

Please do give a new picture for pic 10.
THanks (Are you still looking for comments?)

djcrumples (author)2009-10-20

what are those orange connectors on step 9?

About This Instructable




Bio: Just your average K'Nexer/Programer/Nintendo DS fanatic. Any questions you would like to ask about any of the above? Send me a PM ... More »
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