Semi Automatic Knex Pistol





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!



    • Pocket-Sized Contest

      Pocket-Sized Contest
    • Pro Tips Challenge

      Pro Tips Challenge
    • Paper Contest 2018

      Paper Contest 2018

    We have a be nice policy.
    Please be positive and constructive.




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

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

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

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

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

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

    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* :)

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

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