Picture of (True)Semi-automatic Knex pistol.
I as tinkering around and made a semi-auto one.

Oh and.. I know it's weak, because I made it mostly for scientific design, not for performance. So feel free to take it farther and make a real shooter out of it. : )

Step 1: Hopper and front

Picture of hopper and front
this is the hopper and front of the gun. like the last one, the gray connectors and blue spacers are the hopper ;and the black piece under it is there to stop bullets from falling through.
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Knex4Life233 years ago
Sorry for my lack of knowlegde but what is a Patch.
its ok...
sneature4 years ago
i cant tell what that one piece is connected to the upper tan piece does anyone know what it is
If you are talking about the gray one, it's a 2 way connector. If you are talking about the white one, it's a white rod.
lhinkle4 years ago
really awsome gun but how to fire it
oodalumps (author)  lhinkle4 years ago
Pull the rod connector back like a trigger.
i find that the thing that pulls back the ram needs to be pulled left like a block trigger. i've made the mod that makes the gun true, and i'll post it soon.
oodalumps (author)  X Files4 years ago
If you really want to use this gun, here is the v2. It's a lot better.

oodalumps (author)  X Files4 years ago
Then you built it wrong. The white rod that sticks up on the front of the trigger mech hits that piece from step 4, releasing the pin.
X Files4 years ago
actually upon building it, i've found that the ammo falls out of the bottom of the magazine. i would appreciate it if you could fix that.
oodalumps (author)  X Files4 years ago
Sounds like you didn't put in the black Y connector. Step 1, the only part I put a box over.

But this gun is seriously old (the 6th knex gun ever posted on instructables). It isn't all that great. Just go build the WASP on knexinnovation.net if you want a semiauto.
X Files4 years ago
its a good gun, but the name isnt very accurate. truly semi automatic is where there is no ram that needs to be pulled or pumped or bolted. i have a mech i've been keeping to myself, and i think im gonna release it now. nice gun tho! :-)
X Files X Files4 years ago
o ok i see. but still plz check out min new instructable. i published it literaly 2 minutes ago!
oodalumps (author)  X Files4 years ago
This is a true semi auto. You never pull a ram back, you just pull the trigger.
ultimachris5 years ago
A mechanical masterpiece! Simplistic yet efficient, small but sturdy, it's just a brilliant piece of work! I'm putting this mech in a rifle I'm currently working on if you don't mind. I'll give credit to you if i post it.
oodalumps (author)  ultimachris5 years ago
I once put an up-scaled version of this mech into a rifle. You can use it for reference:

genius mech. do you happy to be KnexGunTutorials or Untd103? Because hes posting instructions of that rifle on his website.

That's actually someone else, who stole ooda's design, and is posting without permission.
What a theif!
I go on that site, Destroying noobish guns makes me feel important.
jmand4 years ago
dude this really is a genius design a bit peicey though like with the 1 conecters
and every thing needs a tune up
but i im gonna try to incorporate this into my pistol im workin on
semi auto will make it that much better
Bartboy6 years ago
If this were posted today, it would be a fail. In many ways.... :(
oodalumps (author)  Bartboy6 years ago
You do realize this is a true semi-auto, don't you?
Yes, I know that. There are a few of them now, and they are better than this. This was fantastic at the time, but it shoots less that 20 feet, and is uncomfortable.
oodalumps (author)  Bartboy6 years ago
The other ones used a lot of pieces and don't shoot any farther.
They do use a lot of pieces, but they do shoot further. A lot further.
oodalumps (author)  Bartboy6 years ago
Are you talking about the pseudo semi-autos that use lots of preloaded rubberbands?
There are many variety's... And this isn't semi-auto. It's a repeater...... (I think)
oodalumps (author)  Bartboy6 years ago
My pistol is semi-auto.
This? It doesn't shoot very fast though....
oodalumps (author)  Bartboy6 years ago
It shoots every time you pull the trigger. What's not semi-auto about it?
Well it's semi auto, but isn't it a repeater?
oodalumps (author)  Bartboy6 years ago
What are you even trying to say?
Is this a repeater or semi auto?
oodalumps (author)  Bartboy6 years ago
It's a semi-auto. I think I've said that about a hundred times. Why even ask?
What is the difference? I am asking you 'cause you probably would be more helpful that google, but I guess not....
oodalumps (author)  Bartboy6 years ago
It's a gun that shoots every time you pull the trigger. You never need to pull back any pins or rubberbands to make it shoot, only the trigger.
And a repeater is...?
oodalumps (author)  Bartboy6 years ago
You pull back something then pull the trigger. Then repeat.
i never knex you wrer on ibles...
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