Instructables

Semi automatic knex pistol

Picture of 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...
 
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Step 2: Start building with the handle

Picture of start building with the handle
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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

Picture of make the rubberband mech
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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

Picture of attach handle and start on magazine mech
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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

Picture of attach the mini scope and start on the forward barrel
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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
crazykiddo2 years ago
great design but u did forget to add up all the pices
inergy3 years ago
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
thatguy953 years ago
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.
Spycrab3 years ago
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* :)
awesome gun i love it 5 stars
it takes way to long to reload you need to make that better
bedbugg2 (author)  will3333333444 years ago
I have retired from making K'nex guns now...I'll leave that for someone else to do :P.
j-chode!5 years ago
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 (author)  j-chode!5 years ago
ok, post away!
It is up, but only as a slideshow as my brother dis-mantled it.
why did he take it apart?
He was probably a jerk.
WTF if u post a knex gun people expect it to shoot knexs
srry thought it was rbg cant see why though...used to be a noob...
bedbugg2 (author)  PieMaster7776 years ago
what? lol...
he probely is a NOOB that did not look through the instructable and just thought it was a RBG.
aikduck4 years ago
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 (author)  aikduck4 years ago
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.
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 (author)  Miles Tails Prower4 years ago
Wow! that really is something...much better than my design, you should post it.
You have to post that gun. It is amazing!
Thank you!!! But I'm VERY lazy, I mostly don't post instructions...
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!
Yup, I'll try my best for you.
Awwwwwww... Darn! =)
actually, ive done my take-on of your gun. ill post pics soon
yerjoking5 years ago
i gots a problem, after a couple of shots a bullet falls out, am i using too powerful elasticbands?
Most likely too powerful on the mag.
DTass5 years ago
Thanks bedbugg2, the gun shoots well
DTass5 years ago
I have the gun built, but I don't understand where to put the green bullets.
bedbugg2 (author)  DTass5 years ago
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 :)
can i use the trigger system for my gun? (cridet to you)
bedbugg2 (author)  knexsuperbuilderfreak5 years ago
sure, post a link when you're done.
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
DrWeird1175 years ago
its a rubber band gun, aint it
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.
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