Introduction: K'NEX Halo 3 Spartan Laser

Picture of K'NEX Halo 3 Spartan Laser

First and for most I want to give credit to I_am_Canadian, whose cannons not only are some of the most terrifying things I have ever seen made from Knex but also inspired this monster.

Here are some of the specks:

weight: 4.4 lbs. (almost 2 kg)
range: with ten rubber bands around 35-40 feet (10 to 12 meters)
*I only have shot this with 10 bands but it is built to handle 20, I just don't have that many right now

Update-added parts list and a step for the ammo (which I only just noticed I forgot to add before)

Parts List:

Black/Green- 209
Grey/White- 176
Blue- 197
Dark Grey/Yellow- 9
Green/Red- 21
Grey/Orange- 1

(1)Grey- 70
(2)Light Grey- 13
(3)Dark Grey/Red- 23
(4)Green- 33
(5)Tan/Yellow- 106
(2)Brown/Orange- 64
(8)Black/White- 64
Half snaps- 124
Full snaps- 49

Blue spacers- 83
Grey spacers- 13
Y-clips- 10
Lockers- 4
Hindges- 4

Step 1: Shoulder Rest and Rear Handle

Picture of Shoulder Rest and Rear Handle

This area can be used to hold extra ammo.

1. make this
2. and this
3. add the two X parts, the three blue rods, and the five connectors with greens
4. make two
5. make one
6. you need five of these
7. assemble the handle...
8. like this
9. trigger
10. add these three rods with Y-clips (start with the one in the white piece) ...
11. and this one
12. put the trigger in
13. add these, don't forget the spacers
14. attach to one side
15. mind the spacers
16. other side and more spacers

Step 2: Bow and Front Handle

Picture of Bow and Front Handle

Basically the front of the weapon that holds the rubber bands and the second handle.
Based on the bow from the hand held V5 cannon.

1. make this
2. and this
3. same as the other handle, all layers are the same
4. same as in the V5 cannon
5. add them to 2
6. make these
7. add them to the handle (add four blue spacers to these rods when you attach the handle)
8. attach handle (spacers)
9. add the bands, two strings of five on each wheel
10. put on the top

Step 3: Rails

Picture of Rails

Two sides of the barrel of the gun.

1. Make this,
2. and these,
3. connect like this,
4. and make it's mirror image

Step 4: Other Parts

Picture of Other Parts

Small parts that don't fit in any category.

1. make this
2. add connector, rod and spacers
3. make this
4. connect 2 and 3 like this
5. don't forget the small grey rod on the end
6. make these

Step 5: Trigger Block Assembly

Picture of Trigger Block Assembly
Rear of the gun, holds the rear of the barrel and trigger mechanism based on that in the V5 cannon.

1. make this
2. and this
3. trigger block
4. back of block
5. make this
6. 4 and 5 assembled
7. make two of the rails and four clips
8. back of the rails from 7
9. assemble 6 and the parts from 7
10. top view of 9
11. add these supports
12. attach part from 2...
13. and the other side
14. add the trigger mechanism from step four*

  • Some parts were removed so you can see where the part fits in, leave them in.

Step 6: Assembly

Picture of Assembly

Puttin' it all together.

1. all the parts
2. add the long piece to the trigger
3. these small parts go here
4. connect
5. add the rails
6. add the trigger block
7. remember to connect these!
8. DONE!

Step 7: Ammo

Picture of Ammo

The orientation of the bow and trigger block components means that the standard ammo for the V5 cannon won't work for this weapon. Here's how to make the new ammo.

Step 8: Loading and Firing

Picture of Loading and Firing

How to load this monster.

1. pull the rubber bands back to here, make sure they go where they are in the picture
2. slide the ammo back and lock it into place like in the cannons, try to get the red piece as close to the end of the yellow rod as you can it will make firing easier
3. move the bands onto the round where they are in the picture

Then pull the trigger (outside please).


knexinventer made it! (author)2014-04-25

I built this about three years ago. today I was going through all of my pictures and I found these.

HolyCross9 (author)2012-12-10

Greetings. I've managed to construct a Spartan Laser out of K'Nex through your instructions but I'm having problems with firing it. For after I've properly loaded it with both rubber bands stretched, the trigger has problems releasing the ammo.

spazgadget (author)2011-07-25

if you had red spray paint then you could spray it red like a laser! SCARY.

knexinventer (author)2011-06-03

i will also use it on youtube

knexinventer (author)2011-05-29

i just finnished it and i love it

apples!!!!! (author)2011-05-24

I like it. Nice job with the construction.

metalchopper (author)2011-04-12

IM A HALO NUT AND I LOVE THE LAZER.if they made a set to build this ID BUY THEM ALL!!!!!!!!!!!!!!

aleceatsfood (author)2011-02-23

amazing!!!! it looks very realitic

KnexFreak360 (author)2011-01-02

Sick gun

xKinGxKilleRxx (author)2010-07-13

Ims charging my lazer

SpeedStrikerXLR (author)2010-06-30

wow it shoots lazers... lol jk

SonicX 22 (author)2010-04-28

 this is the first spartan laser made (well the first spartan laser to be posted, the first spartan laser was made by bakenbitz)

Landon Sullivan (author)2009-10-06



Dude, spellcheck.

Youz iz failzorz!
brandon borick gained 1 Fail point!

sorry but you fail

knexjay (author)brandon borick2010-02-16

actually you fail hahahahahaha noob

brandon borick (author)knexjay2010-02-16

gun in mouth

umm no im looking at the game right now so sorry

1. You have obviously never been on Youtube or you would recognize my words.
2. It is spelled "Spartan."

1 just becuse they use it on youtube dosent mean its right
2 yes there is no (i) but you still spelt i with a (u) mot a (a)
3 im still right so sucket dont bite
4your not alowed to breath any more

1. I talk in 1337 sometimes. That was one of those times.
I'm am going to fire my Spartan Laser.

Happy now?

Spycrab (author)2009-11-16

i'ma firin' mah lazor


knex_mepalm (author)Spycrab2009-12-31

And it's
Cell: I'm firin' mah lazoor BLARGHH
Cell: I'm Firin' my mediocre employee
Mediocre Employee: Oh sh**

BrainlessRat (author)2009-11-13

Nice laser! Best Halo 3 weapon on this website! Nice job!

rathemighty (author)2009-10-21

 You miscounted the Y-clips

assassin1321 (author)2009-10-11

good but a weapon shooting the ammo this uses id expect to be a missle pod and i am canadian wasnt far off  of that so if somone would make that thatd be cool too

jabbathegut1 (author)2009-09-28

E.P.I.C - I ALLWAYS use the splazor when i can on firefight on odst! i allready made the automag ( just made the 'ible )
and was wondering how to a lazor !!!! thanks !!!

legogunman (author)2009-09-06

wow so cool

gerrits13 (author)2009-08-14

i am three blue spacer short

smattman22 (author)gerrits132009-08-31

use one gray soacer or on connector and one blue one

SonicX 22 (author)2009-08-14

oh god that thing is awesome!!!! oh and queston can you use joint's besides hinges or you have to use hinges because i think i only got like 2 - 4

Millawi Legend (author)2009-08-13

*screams horrifically* it use more than 1 hinge!!!!!! i only have 1...

i have like 109 hinges 300 y connecotrs but only 2 blue snaps like the pink one

ashchetm (author)2009-08-02

I'ma build this, GREAT JOB!!!!!!!!!!!!!!!!!! I like videogame guns, and I've always wanted halo weapons, (i made a battle rifle a while ago) and this one is off the charts!!!!!!

smilee (author)2009-07-24

he ment the "piece" locker.

robocrazy155 (author)smilee2009-07-25

Whoops! The small brown connectors that can lock into snow flakes and gears. Their on the yellow rods in step two, pic four.

r3ddr4gon (author)2009-07-23

oh wats a locker?

I_am_Canadian (author)2009-06-25

Haha, very cool! One question - where's the trigger?

Glad you like it. The trigger is near the top of the second handle. Three yellow connectors with white rods.

r3ddr4gon (author)robocrazy1552009-07-23

wow u got a response from I_am_Canadian thats means this is a really really really great gun

AJBrawlLvr (author)robocrazy1552009-07-03

wow- you impressed I_am_Canadian when HE built the cannon this is based on? must be pretty good

r3ddr4gon (author)2009-07-22

dude u are friggin killin me i am buildin this and it is the best gun ive ever seen well not the very best but super best i give u 500*s

joshualater (author)2009-07-21

four letters...OMFG

yashen (author)2009-07-19

This is sick . IMO best halo replica on the site.

TigerNod (author)2009-06-27

Really REALLY cool. The real one is a bit longer though. Still worth a outstanding rating.

robocrazy155 (author)TigerNod2009-07-18

Thanks, tried my best to get it accurate.

TigerNod (author)robocrazy1552009-07-18

You tried your best, and the results were outstanding.

skyer69 (author)TigerNod2009-06-27


mettaurlover (author)2009-07-18

must... build...

About This Instructable




More by robocrazy155:Aeolus - wind powered knex ball machineK'NEX Grenade Round for I_am_Canadian's Heavy CannonsK'NEX Halo 3 Spartan Laser
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