Introduction: Knex Crossbow

Picture of Knex Crossbow

this is my first ever instructable so please excuse any hard to follow directions. this is my "piece conservative" crossbow. it has a range of about 30ft shot flat and 40-50ft angled. it also feqatures a new type of trigger that works really well.
p.s. please rate and sub!

also check out my combat/tactical knife at;

Step 1: Bow

Picture of Bow

make/gather two of every thing although when assembling make in reverse
pic 6 make four 
pic 10 flip to under side

Step 2: Rail

Picture of Rail

pic 1 make three
pic 2 make two
pic 3 gather nine
pic 4 assemble like this
pic 5 add the two other rails
pic 6 add these snowflake connectors
pic 7 dont forget the blue clip
pic 8 attach to bow like this
pic 9 another veiw

Step 3: Handle+trigger

Picture of Handle+trigger

Step 4: Fore Grip

Picture of Fore Grip

i know it  is too simple please elaborate and show me your own versions
pic 1 make two

Step 5: Main Bands

Picture of Main Bands

do exactly as the pictures show and you should have no problems

i used two 8in bands that r broken but u can put two 6 or 8in bands together and just anchor them in the same places as shown
pic 4 it is crucial that when loading, that the band(s) r placed higher than the notch in the connector

Step 6: Your Finished

Picture of Your Finished

now go out and have fun

Step 7: Who Else Made It?

Picture of Who Else Made It?

First picture is of the creation by Blackhawk7992. The second picture is by mrknex3000 as well as the third being his new grip. If you build it please post a picture of it and I will put it in the instructable ASAP with credit to you of course, HAPPY BUILDING!


Glorp made it! (author)2017-01-28

I didn't have the jointed part for the trogger, so I used my own design.

Linkin_J_Knex (author)2015-09-04

cool crossbow:)

Petecerea (author)2015-05-30

Nice bow I have a battle fleet I posted and a mp40 and ak74 if you want to see it please tell me on my fleet

Harvey knex (author)2015-04-19

You should enter this into the contest

peter---peter (author)2015-04-17

how does the trigger work?

knex builder. (author)2014-12-21

Nice might build check out my new guns. I love my new guns

JustinS1 (author)2014-08-15

i am so making this

victorstory (author)2014-07-29

These instructions were confusing and hard to follow, please make a better one, because I can't make it with these

fighting coaster (author)2014-05-27


Atom 6 (author)2013-08-22

Make a video!!! I really want to see it working cause I think I don't have enough parts.

the_boss_builder (author)Atom 62013-09-16

I will first apologize for being untimely in my response, and then I will tell you that I may rebuild the crossbow and put up a video. I will first need to do some pretty serious posting of other instructables of various sorts.

War pig (author)2013-07-09

This is sick looking........I would build it but I don't have very many yellow peices

Silent_Shadow (author)2013-07-05

Great Bow but I couldn't make the firing slot cuz lack of pieces, I added it onto a design I had made earlier and improved it quite a bit, thanks

cool, I'm glad you like it!

LvNo1000 (author)2013-03-12

WHOA. Now, thats an impressive first instructable! true trigger and everything! :O *impressed*

thank you very much, I appreciate your positiveness. The trigger was my own idea and I hope to build more innovative things, I would like to see more of your stuff as well!

knex dude 2000 (author)2013-02-28

Alright robin hood. lol this is epic. totally great instructions.

4lifenerdfighter (author)2012-09-27

Better arrow design: Connect a red connector to the end of a grey rod, looking like an arrow. Then, connect a green connector to the other end of the arrow. On the green connector's other side, connect a white rod. This makes the arrow able to stay on the "runway" the whole time, and still have the rubber band grab the arrow.

sorry crazy late reply, could you post a picture of what you are talking about for some reason i cant see it in my head ':/

In order: Red connector. In the middle slot, put a grey rod. Then 4-slot connector, on the end slot. Then put a white rod on the other end of the 4-slot. Sorry I don't have a camera.

Killer~SafeCracker (author)2012-04-15

Well not to put you down or anything because I know how cool it is to get featured, but I think "Raz1r Knex Bull3t" has a point. I am a little surprised this got featured too. But I don't think telling him to make a good Instructable, get featured, then come back was really in line. He has made several good Instructables too. But congratulations on being featured, keep the Knex world going!

yea ur rite i was just a little ticked off cause i wrote to please be nice with ur comments on the ible' and spoke my mind.

thanks for that last part

i sound so stupid trying to text talk like that and apologize for that any one whom may indeed care

4lifenerdfighter (author)2012-09-15

Pic 3 where does the 3way connector connect to the rest of the gun?

what step?

nevermind. The trigger mech is confusing.

oh it dosnt, it is there to push the end of the arrow out from the notch of the snowflake connectors. in turn this fires the arrow.

4lifenerdfighter (author)2012-09-13

you need to post a BOM.

a what??

bill of materials. How many of each part is needed.

i dont know, i would have to build it again to find out, and i probably wont get around to that real quickly, but yes eventually it will get put in

zakman2810 (author)2012-08-29

please make your photos clearer and explain further how to make the crossbow

please just try your hardest, i have no more pics

imogensen (author)2012-09-09

I was wondering if you had any other posts that are anything like this one, like a lego rifle?

i dont build lego guns only knex, sorry.

4lifenerdfighter (author)2012-09-15

Step 1 pic 3. what is the point of these pieces? It doesn't look like they attach to anything.

spacer/strengthener/looks cool

zakman2810 (author)2012-08-29

on step 1 number 6 how do you get the grey piece onto the other piece

just line them up like it shows and push them together really hard until you hear a rather loud "click"

PotatoCoffee (author)2012-08-24

How did this get featured?

please dont nitpick at old discussions that have been settled and just read the other comments.

No! I didn't mean that's as a negative comment! It was actualy because of the pictures, I'm sorry you interpreted my comment that way!

Blackhawk7992 (author)2012-08-06

i finshed making it today...shot my cousin

here it is


good job, how is it working for you?

just great. Can shoot just about anything.

nice you could try to make it longer if you want to get more power, my friend made it and used 12 yellow 5 slot connectors instead of 9, his shot about 65-70 feet on average. although you dont have to you could do it any way just for "laughs and giggles." you could also make arrow like, well, arrows for greater accuracy along with the amped up power

mrknex3000 (author)2012-06-27

Finally. Judging from the comments am i the onlyone who managed to build this crossbow? Its amazing. I would estimate i got it to shoot 25 feet. It might have gone further but there was a wall in the way.

Blackhawk7992 (author)mrknex30002012-08-04

i can build it...I just dont have enough peaices

About This Instructable




Bio: ╔═╦╗╔╦╗╔═╦═╦╦╦╦╗╔═╗ .........║╚╣║║║╚╣╚╣╔╣╔╣║╚╣═╣ .........╠╗║╚╝║║╠╗║╚╣║║║║║═╣ .........╚═╩══╩═╩═╩═╩╝╚╩═╩═╝ I'm 18 and love to build anything. I love to share what I make and see how people mod it so please mod the ... More »
More by the_boss_builder:30's Ford Hot Rod SketchK'nex Formula One Dune Buggyknex combat/tactical knife
Add instructable to: