Introduction: Semi Automatic Knex Pistol

this is it! the first ever true trigger semi automatic bottom loading magazine pistol.i was playing around with different mechanisims of how to make a semi auto like having the trigger pull back the ram but this did not work so i moved on to a multiple rubberband system and how a rbg could be adapted and this is what i found...

Step 1: What You Will Need...

this is what you will need...

Step 2: Start Building With the Handle

we will start at the back of the gun and work to the front :)

1:make 2 of these

2:make this

3-5:connect them together

Step 3: Make the Rubberband Mech

1:build 1 of these (they are A)

2:build 2 of these (this is part B)

3:build 1 of these (this is part E)

4:build 3 of these (this is part C)

5:build this(this is part D)

6:take 1 part C and do this

7:take part B and connect it to part D like this

8:take another part B and attach it to part B-D-C like this

9:finish it off

10:take another part C and do this

11:put it through there and through part B

12: then put it through part E

13: do this to another part C

14:put it through here

15:add part A and the spacers done!

Step 4: Attach Handle and Start on Magazine Mech

now attach the handle and build the magazine mech

1-2: attach handle like this

3:build these

4:grab these parts

5:attach them like so

6:add it to the rubberband mech

7:make this

8:add these

9:add these

10:add this to the top

11:add a stub on a white rod to the top

Step 5: Attach the Mini Scope and Start on the Forward Barrel

1-2:connect the magazine to the handle and rubberband mech like this

3:build these

4:connect them together with 2 yellow rods

5:connect that to the magazine with 2 green rods like this(note:black rods are also green rods :))

6:build these

7:connect them together

8-9:add these

10:connect to the top of the magazine

11:add side panels

12:connect 6 blue rods evenly

13:build these

14:connect them like this

15:build these

16:connect them like this

17:add this part

18:build these

19:add them like so

20:add this part to finish :D

Step 6: How to Prime the Gun and Firing

1:build this and insert it into the bottom of the magazine(it is the multirod)

2:attach rubberband from here

3:to here!

4:grab the 7 rubberbands

5:clip them into here

6:grab your ammo! (7 green rods)

7-9:grab your multirod and pullback each band with it,thread it under the scope and hook it on the toothed wheel at the back of the gun

10:all rubberbands cocked

11:pop the multirod into this stub(sorry i didnt include the stub earlier add it now) and pop the rubberband back on it

12:push the scope down

13:load the ammo

14:replace the multirod

15:pull the scope back up

16:happy shooting i hope you enjoyed this instructable and will have fun with this gun goodbye!


crazykiddo made it! (author)2011-07-18

great design but u did forget to add up all the pices

inergy made it! (author)2011-01-08

This gun, is.. Ok... much better guns on instructables

The Jamalam made it! (author)The Jamalam2011-07-09

It was way ahead of its time when it was posted. 4 years ago.

thedraganime made it! (author)2010-12-16

cool looks like a skorpion at the angle from the last picture im gonna try it out

thatguy95 made it! (author)2010-07-21

ever noticed how all the good guns seem to not have the pictures just to annoy us?

14r31337 made it! (author)14r313372010-08-27

Copy and paste the picture into some picture editting program to see it.

Spycrab made it! (author)2010-08-17

I built it, it was kind of inaccurate, slow reload, but the handle (when changed around a tiny bit) was SO FREAKING COMFY :D I'm going to have to change it around to just be an rbg and use it for the kick-butt handle. Overall...4* :)

iloveemogirls made it! (author)2010-06-16

awesome gun i love it 5 stars

will333333344 made it! (author)2009-12-19

it takes way to long to reload you need to make that better

bedbugg2 made it! (author)bedbugg22009-12-20

I have retired from making K'nex guns now...I'll leave that for someone else to do :P.

j-chode! made it! (author)2008-08-04

I modded this a bit, so its like a table-top cannon. When you press down on the top, it fires and then it springs back up again. Semi auto of course. If I post it, I'll give you 77% credit.

bedbugg2 made it! (author)bedbugg22008-08-06

ok, post away!

j-chode! made it! (author)j-chode!2008-08-08

It is up, but only as a slideshow as my brother dis-mantled it.

The Jamalam made it! (author)The Jamalam2009-02-19

why did he take it apart?

DJ Radio made it! (author)DJ Radio2009-10-08

He was probably a jerk.

PieMaster777 made it! (author)2008-02-07

WTF if u post a knex gun people expect it to shoot knexs

PieMaster777 made it! (author)PieMaster7772009-08-24

srry thought it was rbg cant see why though...used to be a noob...

bedbugg2 made it! (author)bedbugg22008-02-08

what? lol...

dsman195276 made it! (author)dsman1952762008-02-11

he probely is a NOOB that did not look through the instructable and just thought it was a RBG.

aikduck made it! (author)2009-07-11

i've experimented with having a full auto knex using the rbg style mechanism but the rubber bands all shoot before the bullets can be reloaded by the magazine. How do i slow the mechanism down that releases the rubberbands?

bedbugg2 made it! (author)bedbugg22009-07-12

Yeah, i came into the same problem when i tried to make mine fully automatic...the only solution i could think of would to be to use some kind of geared mechanism to slow down the rubber bands.

Miles Tails Prower made it! (author)2009-02-23
I made something similar...

BUT!!!! before you say it is better, this one is made first so it is better. Very good work. 4.5 stars!!!
bedbugg2 made it! (author)bedbugg22009-07-12

Wow! that really is something...much better than my design, you should post it.

the_builder made it! (author)the_builder2009-04-06

You have to post that gun. It is amazing!

Miles Tails Prower made it! (author)Miles Tails Prower2009-04-07

Thank you!!! But I'm VERY lazy, I mostly don't post instructions...

the_builder made it! (author)the_builder2009-04-08

Wait, I did notice that you do post videos of instructions, so would you be willing to do that? I you just do want to, thats fine. It doesn't make a difference to me!

Miles Tails Prower made it! (author)Miles Tails Prower2009-04-08

Yup, I'll try my best for you.

the_builder made it! (author)the_builder2009-04-07

Awwwwwww... Darn! =)

therandomperson made it! (author)therandomperson2009-04-06

actually, ive done my take-on of your gun. ill post pics soon

yerjoking made it! (author)2008-06-07

i gots a problem, after a couple of shots a bullet falls out, am i using too powerful elasticbands?

Wafflicious made it! (author)Wafflicious2009-01-17

Most likely too powerful on the mag.

DTass made it! (author)2009-01-09

Thanks bedbugg2, the gun shoots well

DTass made it! (author)2009-01-08

I have the gun built, but I don't understand where to put the green bullets.

bedbugg2 made it! (author)bedbugg22009-01-09

you put them in the magazine, picture 3 on the last step, the part wite lots of white snowflakes. you take the rod out which is held in by the elastic band, drop them in one by one, once you have loaded all 8 you put the rod back in to press them against the sight. just message me agian if you have any more problems :)

knexsuperbuilderfreak made it! (author)2009-01-03

can i use the trigger system for my gun? (cridet to you)

bedbugg2 made it! (author)bedbugg22009-01-03

sure, post a link when you're done.

stale56 made it! (author)stale562009-01-07

how bout me? i have an excelent mech (in my opinion) and i was looking for something so it can shoot rods to (i was to lazy to look at the dunkis's mech and follow it). if u wanna see i have a link to the forums here so can i please base my rod shooting mech off of urs? i will give u credit in any way u want me to. i feel like a complete idiot begging u for this...


ok thanks

DrWeird117 made it! (author)2008-07-12

its a rubber band gun, aint it

Stavroz made it! (author)Stavroz2008-10-25

Dont you get it??? the bullets are fired with the rgb system. the rubberband push against the bullet and fires it. with the rbg wheel, you can add more rubber bands than one, so its semi auto.

DrWeird117 made it! (author)DrWeird1172008-10-25

oh...I see.

bedbugg2 made it! (author)bedbugg22008-07-15


kennyboy 2 made it! (author)2008-10-24


yerjoking made it! (author)2008-06-08

yay, gave it a stock and a foregrip,and a sort of detatchable mag what you click into the other and turn the gun upside down to load the bullets, and btw, to pull elastin bands back easier just pull off the scope, and begin loading =]

thomaswatton made it! (author)thomaswatton2008-10-12

Yerjoking post the mod for it i'll defo build it

yerjoking made it! (author)yerjoking2008-10-12

That was ages ago, I don't have the gun anymore

thomaswatton made it! (author)thomaswatton2008-10-12

even if it has that prob

Gh{O}sT made it! (author)2008-08-02

heheh big pistol

thomaswatton made it! (author)thomaswatton2008-10-12

its not big its houmungous for a pistol

ninjusk made it! (author)2008-09-07

i like it +5

About This Instructable




Bio: I like mountain biking, its my main sport and i own 2 bikes so anything to do with bikes interests me, i also used to ... More »
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