Introduction: Truly Semi Automatic Knex Gun

Picture of Truly Semi Automatic Knex Gun
This gun is based off of KNEmovies design, but not his mechansim. the mechansim may be similar to his, but mine is not that complicated. My gun is not that powerful, as it only shoots 5-10 ft. I hope you enjoy my semi - auto gun.

Step 1: The Handle

Picture of The Handle

This is the construction of the handle. Very simple.

1 Build 2 of these (a)
2. Build 3 of these (b)
3. Connect one of (a) to a blue rod.
4. Connect all of (b) to the blue rod.
5. Connect the last (a) to blue rod
6. Top view of the handle
7. Side view of the handle

Step 2: The Pusher

Picture of The Pusher

This is the pusher that pushes the bottom part of the firing part that makes the trigger come back to its original position.

1. A view of the pusher.
2. Make this. (a)
3. Side view of (a).
4. Add 4 red connectors to a blue rod.
5. Add a blue rod to the red connectors, then you add an orange connector and the orange track
connector to the rod. (b)
6. Connect (b) to (a).

Step 3: The Magazine

Picture of The Magazine

This is the magazine that shoots white rods. Not that far though... 5 - 10 ft.

1. The magazine.
2. Front view of magazine.
3. Build 2 of these. (a)
4. Build these. (b)
5. Build this. (c)
6. Side view of (c).
7. IMPORTANT! Must have these 2 spacers on (c) or else the trigger will be EXTREMELY difficult to be
pulled back by rubber bands! ( If you don't have these, you'll realize what I'm talking about ).
8. Add 1 (a) to (c).
9. Add the last (a) to (c).
10. Add 1 (b) to (c) and the other (b) to (c) as well. Then add yellow rod on top.

Step 4: Some Pieces You'll Need

Picture of Some Pieces You'll Need

These are just the pieces you'll need later.

1. Build one.
2. Build one. (The middle tan connector is really a blue metallic connector, so add that instead)

Step 5: The Trigger

Picture of The Trigger

This is the trigger. Really simple.

1. Build 3 of these. (a)
2. Connect all of (a) to a blue rod. Look carefully where the rod is connected.

Step 6: The Firing Pin

Picture of The Firing Pin

This is the firing pin that once you pull the trigger, the firing pin will pull back itself and shoot.

1. Make these. (a)
2. Connect (a) just like this.
3. Make this. (b. The black rod is a gray rod, so don't be freakin' out about not having this...)
4. Connect (b) to (a).

Step 7: The Top Part

Picture of The Top Part

This is just the part that covers the mechanism. It's not needed, but go ahead and build it anyways...

1. Build This (a)
2. Remember the 3 y connectors.
3. Build 2 of these. (b)
4. Connect the (b)'s to (a).

Step 8: The Frame

Picture of The Frame

This is the frame that supports everything.

1. Build 2 of these.
2. If you cant see far, i added this (a)
3. Same with 2. (b)
4. connect (b) to (a)

Step 9: Orange Connectors

Picture of Orange Connectors

In this step you will add orange connectors to the second frame you built earlier.

1. Add orange connectors to where shown.
2. If you cant see far, then look at this picture.
3. " "

Step 10: Adding Firing Pin and Trigger

Picture of Adding Firing Pin and Trigger

In this step you'll add the firing pin and the trigger. It shouldn't be complicated to place them on the frame.

1. Place the firing pin and trigger where shown.
2. If you can't see far, see this. Place firing pin here with a blue rod.
3. Place this after you put the black/gray rod in the orange connectors.
4. Place trigger here
5. This is how it should be

Step 11: Connecting Frames

Picture of Connecting Frames

Connect the frames.

1. Take your both frames.
2. Connect 1 of the frames to all the orange connectors and the blue rods.

Step 12: Connecting Parts

Picture of Connecting Parts

In this step you will connect the pusher and the other parts you built earlier.

1. Take you pusher
2. Connect it to where shown
3. This is how it should look like
4. Take the blue rod with the 2 tan clips and the blue metallic one
5. Connect it to where shown.
6. Take your blue rod with the 5 green connecters
7. Connect to where shown

Step 13: Connecting Magazine, the Top Part, and the Handle

Picture of Connecting Magazine, the Top Part, and the Handle

In this step you will connect the magazine, the top part and the handle.

1. Take the magazine
2. Connect it
3. Very important to have 1 blue spacer in each yellow rod!
4. Take the top part
5. Connect it
6. This is how you connect
7. Take your handle
8. Connect it here

Step 14: Rubber Bands

Picture of Rubber Bands

In this step, you will add rubber bands to the finished gun. You will need plenty of rubber bands for this step.

1. Take your rubber bands
2. Place rubber band on the firing pin. Stretch and put it around the 2 white rods with the orange connector to the other side of the firing pin.
3. Place only 1 rubber band from the white rod connected to the 3 purple connectors down to the blue rod as shown.
4. Add only 2 rubber bands from the pusher to the blue rods. (1 blue rod is on one side, the other on the other). Add more rubber bands if the pusher isnt pushing the firing pin so the trigger can come back and and shoot correctly.
5. (Second blue rod is shown)
6. Add plenty amounts of rubber bands from the green connector's blue rod to over the next blue rod and to the trigger. :)
7. (Where to place the rubber bands in the blue rod)
8. You are officially weilding a truly semi automatic gun created by ednator55. Enjoy and don't "kill" noone!


DukDukboy101 (author)2017-04-17


Luisguitarist04 made it! (author)2016-08-03

Mine works fine

georgieporgie (author)2008-10-13

mine doesnt work..

georgie porgie pudding pie, kissed the girls and made them cry sorry, I had to

georgie porgie pudding pie, kissed the girls and made them cry sorry, I had to too

both of you are wrong, its georgie porgie pudding and pie, kissed the girls and made them cry.

ps...have you ever kissed a girl?....... 

knexmaster9 (author)hedzup4562014-11-03

I am 10 so no :D

_kira_ (author)ILIKEPIE3332009-07-04

lol roflmfao

J4mm3r5 (author)ILIKEPIE3332009-05-28


ILIKEPIE333 (author)J4mm3r52009-05-28

it really annoyed the kid everybody did it too lol

J4mm3r5 (author)ILIKEPIE3332009-05-30



knexmaster9 (author)2014-10-21

Add a thick rubber band, I got 15 ft by doing it

Doc Penguin (author)2014-08-29

holy sh*t your good....

mind if i mod it

make it a better gun with your name in the *special thanks* space???

JustinS1 (author)2014-08-08

i wish i can make this but i dont have enough pieces try to make one with less pieces

drudd1 (author)2013-07-23

that is an awesome gun i might make it but put the mag the other way round so it looks like a proper gun and have something to push the bullets up ... :P

instructaguy (author)2012-07-14

It would be nice, but mine only shoots 10cm

daredevil499 (author)2012-06-04

I built it and it is a nice gun. thanks.
5 stars and subsciption.

daredevil499 (author)2012-06-03

nice looking gun. . . I just started building it 2 minutes ago.

Element Force (author)2012-05-29

I have no orange connector like that can i use something else

nawien01 (author)2012-03-04

if you don't build the orange conector and the bleu rod it shoots better nice gun anyway i like the mech

nawien01 (author)2012-03-04

that orange thing do you need it.. i don't have it..

jake scythe (author)2012-01-01

This gun is not that great i used my best rubber bands (usaully increses the range about 20 feet) but it does not work very well not even 8 feet of range.

owner01324 (author)2011-11-03

hi. i commented so i could find out how to power up the gun

Snosageman99 (author)2011-10-22

Do you need the orange thing with the pins? Is there anything else i could use

geoff-2009 (author)2010-09-11

this gun is a nice design but it lacks in power so i upgraded i to i stronger fire pin and elongated the barrel now it shoots 50 ft for instructions write a comment

wabawaba (author)geoff-20092011-10-09

I really doubt that

knexinglemon (author)geoff-20092010-10-03

yea make instructions to make the gun powerful

lowe (author)2011-03-16

I pulled the trigger... boom. I woke up in the hospital. It blew up in my face!!!!!!! U owe me 2 hours of my life back, and my knex shotgun.

DB2016 (author)lowe2011-07-07

Yeah, usually this happens (the second part) I know whatcha mean. Not this gun, but others.

superbestknex (author)lowe2011-06-16

hey are you serious you woke up in the hospital

Sketch98 (author)2011-06-14

A factor that makes this gun lose power is the make shift hinge connecting the hammer to the ram. If you used a real hinge it would stop the loss to power.

legoneurt (author)2011-06-14

This is so cool!!!

Mikestr12 (author)2011-05-14

The faster the trigger move the more power it has +more mass on the pin and top it of with small ammo. Mass x Acceleration = Force. Being a geek is awsome

assassinman (author)2011-04-16

it looks like a g11 im gunna biuld it tomorow :D

moishyb (author)2010-08-26

Awesome gun! 5 stars and subscribed

knexsniper123 (author)2010-08-02

the pictures wont show up help plz

billythebob (author)2010-07-25

perfect to torment me brother with

anres321 (author)2010-07-04

I have been searching for something like this for years !! this is a very good idea !! Respect 5*

instruct39 (author)2010-06-23

dude you are the first person ive seen that actually built a TRUE semi-auto knex gun. Some people think they have but they havent. i have seen your mechanism in a revolver cap gun before, and is that where you got it? Anyways truely great gun even thogh the range isnt the best. 5*

asdfda3432 (author)2010-04-14

One problem, when I pull the trigger, nothing shoots. Instead, the bullet gets stuck in the magazine.

asdfda3432 (author)2010-04-13

By the way, Can you please give me a part list of this gun? I need it when I'm building so I can organize the parts. (Helps me build faster)

asdfda3432 (author)2010-04-13

This is epic!

jopperdepop (author)2010-02-18

 I built it, I really like the firing mech, but the only downside is that it doesn't shoot far:(
good gun though

Raikou-san (author)2009-12-16

What does the "pusher" do exactly? Is it needed for the mech to work?

james4 (author)2009-10-06

mine sucks

_kira_ (author)james42009-10-17

Try this one, its better

stopanator (author)2009-09-08

motered it it is now a turret

lockeyluafc (author)2009-09-02

nice design and tht but really really bad shooting power and range

NYPA (author)2009-09-02

great mech, great design but not great range. 4.5 stars.

dude10 (author)2009-08-09

Really try to up the power. Good trigger mech

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