Introduction: K'Nex Semi-Auto

Picture of K'Nex Semi-Auto

This is a gun I made in my free time, and my new hobby is making harmless and useless weapons from household junk. My first one is my K'Nex 3 round semi-automatic rubber band shooter. NOTE: this is a prototype! I know i can make it better so please leave your comments and pictures!

Step 1: Create the Frame

Picture of Create the Frame

Look at the pictures to figure out how to make the shooting frame thing

Step 2: Make the Handle

Picture of Make the Handle

Again, look at the pictures.

Step 3: Connect the Two

Picture of Connect the Two

Pictures, pictures

Step 4: Conect the Two Frames

Picture of Conect the Two Frames

Use blue sticks to connect the frames. Look at ALL of the pictures in this step if you want to do it right.

Step 5: Make the Barrel

Picture of Make the Barrel

I forgot this step...

Step 6: Connect the Barrel

Picture of Connect the Barrel


Step 7: Add These Cool Things.

Picture of Add These Cool Things.

These things just look cool

Step 8: The Hook

Picture of The Hook

Add the hook, look at the pictues.

Step 9: Loading the Gun

Picture of Loading the Gun

Place the rubber band on the hook and pull back and under the frame. Hook the first rubber band on the second barrel thing. Then load the second one on the first hook of the barrel

Step 10: Shooting

Picture of Shooting

Basically, hold the hooks until you want to shoot. To shoot one, release the hook and put your finger back on the second one. To fire the next one, let go.


petey2000 (author)2013-03-25

what duz this piece of junk shoot

dr. richtofen (author)petey20002013-05-10

This is almost 7 years old, so of course it's not as good as todays guns. Back in 2006, it was one of the first k'nex guns, so don't call it a piece of junk.

PotatoCoffee (author)2012-08-29


luke11wolf (author)2011-08-18

this is a worthless piece of junk

Inventor X (author)luke11wolf2011-09-24

Please reconsider your statement, because this was made back in 2006, where innovation was just beginning with the subject of Knex. It developed over years into greater weapons we know today, but this is like one of the original guns made out of Knex that actually work..

luke11wolf (author)Inventor X2011-09-25

for now days its bad but i guess for back then its ok

lilknex (author)2011-04-21

It's a good model but loading it takes like a minute.

thatgreasymechanicguy (author)2010-10-10

wow a semi from THAT? wow-just-wow.

tayatipoop (author)2010-09-01

i biult it wercs better then it looks

KnEx_MaStEr (author)2010-08-04

pants gun 1.0

What are you on about?

the gun

This was made 4 years ago, you do know that right?


Knex Lego Maniac (author)2006-11-15

Check out my gun made w/ K’nex watch the vid on step#18 2 c it shoot my sniper rod 200ft. this children’s toy is no longer a toy search keyword Knex Gun

is it really a childrens toy

skwurul (author)disco diva2007-05-15

No. You WILL injure someone really badly/kill them if you fire KillerK's gun at a person.

I_am_Canadian (author)skwurul2008-08-04

Its still a toy.

grevious (author)I_am_Canadian2008-10-23

lol it is still a toy, for older people.. but i wouldnt hand it to a 6 year old...

I_am_Canadian (author)grevious2008-10-23

A 6 year old would not know how to use it.

kray953 (author)I_am_Canadian2009-09-18

my 3 year old bro knos how to shoot my mp5 lol he shoots it at me lololololololol

grevious (author)I_am_Canadian2008-10-23

well it's pretty easy to slide an orange connector upwards so i wouldnt doubt it... but it would be an accident though.

I_am_Canadian (author)grevious2008-10-24

You would have to tell him how to use it.

grevious (author)I_am_Canadian2008-10-25

i could, but i wouldnt because it would we too dangerous. but it coul still be an accidnet to just slide it up, it's not that hard.

I_am_Canadian (author)grevious2008-10-25

Whatever.... XD

Bartboy (author)I_am_Canadian2008-10-23

Well, I made my first knex gun at 7, and it was just 8 red rods on ? white connectors ( enough to fill it) And a simple on piece block trigger , shot through windows. Then I stopped a bit, found my stash of knex in attic at 11, used for a project, and have joined instructables in april a few months after. So I beg to differ

I_am_Canadian (author)Bartboy2008-10-23


cobra (author)Knex Lego Maniac2008-02-06

when I try to load my killerk pistol like you do, the handle just rips off,

Knex Lego Maniac (author)cobra2008-02-06

it shouldn't did u use the ball joint connector pieces

cobra (author)Knex Lego Maniac2008-02-16

I dont think so.

I_am_Canadian (author)cobra2008-08-04

Thats why.

dude ur gun has most comments on site it rocks!!(killerk's gun i was talking about.

knexpert1 (author)2009-08-15

this weapon is very cool ( eh not) dont make these gun you need to shame at you

Dude this was the second knex gun ever posted. This was a first back then.

Yukondano2 (author)knexpert12009-08-15

Ok, no shame should be pointed towards him. Just because his design may be bad in your opinion doesn't mean he has to completely stop making them. Nor does it mean you should shame him. Its kind of rude.

knexpert1 (author)Yukondano22009-08-17

oke sorry than (friends)

Owenmon (author)2008-11-20

how can you possibly get something this simple and stretch it out to 10 steps? seriously i could make this from the intro page x)

knex_mepalm (author)Owenmon2009-07-30


irwinner (author)2006-08-28

mines better its more gun like and easyer to shot check it out on my website

You made a whole website devoted to your knex guns? Pretty lame...

no thats just one page the others are filled with explosives, hacks, and cannons

J Moneyman (author)irwinner2008-11-08

u copied my picture! my feelings r hurt.

Stavroz (author)irwinner2008-10-27


mickey shimitz (author)irwinner2006-09-13

I've built some knex guns to there tight abd I would love to have some plans lol

alwayzbored012 (author)2008-08-31

the hardest part.

pakman227 (author)2008-07-10


Knex_Gun_Builder (author)2008-07-03

sorry killerk it is actually good

The Jamalam (author)2008-06-17

what's wrong with the killerk pistol?

carrothead23 (author)2008-04-26

put more bands on it

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