Semi Automatic Knex Pistol

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About: 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 make K'nex guns but have since retired...to making instructables about games and other th...

Intro: 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!

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    287 Discussions

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    crazykiddo

    7 years ago on Step 6

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

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    thedraganime

    7 years ago on Step 6

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

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    thatguy95

    8 years ago on Step 1

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

    1 reply
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    Spycrab

    8 years ago on Introduction

    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* :)

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    j-chode!

    10 years ago on Introduction

    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.

    4 replies
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    dsman195276bedbugg2

    Reply 10 years ago on Introduction

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

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    aikduck

    9 years ago on Introduction

    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?