Introduction: Z3 Knex Gun (3-Barreled Semi-Auto Pump Action Revolver)

Picture of Z3 Knex Gun (3-Barreled Semi-Auto Pump Action Revolver)
After much anticipation I have finally posted my Z3. WARNING: This gun is not for new builders. The instructions get difficult in the last couple of steps because I was having a hard time with them and I've taken far too long with this, but I should have given you all the information you'll need to make it function. Also be warned that this takes a ton of blue clips (about 30 I think).

This gun fires three rounds semi-automatically for each pump. It has 40 or so feet of range when you use the proper elastics (use ones that look like the kind I used). The long front end is on there to allow you to rest its weight on things (the front rest combined with the curved butt allow you to keep all the weight off your hands when you are stationary. Although not a great war weapon as the trigger mech is touchy, it weighs 9 pounds and is top heavy. Fun engineering and fun gun though.

Firing Demonstration VIDEO:

Step 1: Handle

Picture of Handle

1: Build this.
2, 3: Build this.
4: Connect.

Step 2: Pump

Picture of Pump

1: Build this.
2: Build this.
3: Build this.
4: Slide part from step 3 onto part from step 2.
5: Attach a white connector to the yellow rods as shown.
6, 7: Continue to attach white connectors until the row is filled.
8: Add the rest of the pieces to complete the plate (it should be the same as the one on the other side when finished).
9, 10: Insert the pump.

Step 3: Butt

Picture of Butt

1: Build this.
2: Build these (7 layers)
3: Slide parts together.
4, 5: Push in the yellow rods that are attached to the 7 layers.
6, 7: Attach the connectors shown (don't attach the small green rods yet)
8: Push the connectors in place as shown.
9, 10: Add the small green rods.

Step 4: Block Structure

Picture of Block Structure

1, 2: Build this.
3, 4: Build this.
5, 6: Connect.
7, 8: Add outer layer as shown one piece at a time on the RIGHT side only (make sure that you are adding the parts to the correct side).
9: Copy the panel that you just added on the right side to the left side while leaving out the two connectors and attaching green rods as shown.
10, 11: Build this.
12: Nestle it in place.
13: Add two white connectors and their attaching green rods to complete the left panel.
14: Build these three blocks (add cut in half green rods or cut the tips from longer rods to put on the tops of the blocks in the orange connectors for strength).
15: Insert them as shown.

Step 5: Top Pins Guide

Picture of Top Pins Guide

1-4: Build this.
5-7: Build this.
8, 9: Connect.

Step 6: Bottom Pins Guide

Picture of Bottom Pins Guide

1-3: Build this.

Step 7: Trigger Mech

Picture of Trigger Mech

This step is going to be difficult as this part of the gun is very complex and asymmetrical. I did the best job I could but some of the parts aren't even in these instructions so you'll have to do a little bit of figuring things out on your own. The grayed out areas are only there to make it easier to see things.

11-13: The blue rods in the images don't need to be blue rods, but do need to be cut rods.

Last photo: Before you close the mech up, make sure that it's done to the best of your knowledge and that it will work.

Step 8: Firing Pins

Picture of Firing Pins

1-4: Build this.

Step 9: Turret

Picture of Turret

Step 10: You Figure Out the Rest

Picture of You Figure Out the Rest

Lol, sorry, but I had a hard time with these instructions. Please look at every photo so that you can read all the notes.


ProtectTheAlphaWolf (author)2017-03-28

400th FOLLOWER!!!!!!!!!

Linkin_J_Knex (author)2015-09-24

0_o.... That's all I have to say...

pwnful (author)2012-09-08

sweet jesus.

Oblivitus (author)pwnful2012-09-09

I can make it bigger if you'd like. :)

LvNo1000 (author)Oblivitus2014-01-03

Next time, make a 18 round grenade-shooting true trigger semi-auto removable mag turret-fed bolt action (pump action no necessary, but desired) gun. The Z3 just wasn't big enough for me

Oblivitus (author)LvNo10002014-01-07

Okay. I'll mount it on an elephant when I'm done.

aajaces (author)2012-10-08

lol this step might take... a couple days, thanks for the clear instructions =D

Oblivitus (author)aajaces2012-10-09

Yes, I know, I'm sorry. I did warn about it in the intro though.

aajaces (author)Oblivitus2012-10-13

Oh, lol i didnt read that. And i gave up, theres too much unknown

Oblivitus (author)aajaces2012-10-13

I don't know what experience with knex guns you have so I'm not sure if this applies to you or not, but this gun is a difficult build to start with. Start simpler if you are in fact new to this. I'm sorry it didn't work out for you.

aajaces (author)Oblivitus2012-10-21

Yea, just don't have the time or patience. I'm not terrebly new to knex, I've been around for a while, but haven't made an account until now. The only reason i've built this gun is for me to understand the mechanics and I understand them now, so it wasn't a complete waste. Thanks

Oblivitus (author)aajaces2012-10-22

Oh, okay. You should build Sharir's S3 if you want to learn about some serious mechanisms. The S3 is a continuation of my 3252 project which the Z3's trigger mech derives from. So the Z3 is just an offspring of the S3.

An Villain (author)2012-08-30


Oblivitus (author)An Villain2012-08-30

I don't know what that means.

Inventor X (author)Oblivitus2012-08-30


Oblivitus (author)Inventor X2012-08-30

Ahh, so he's toasting me?

An Villain (author)Oblivitus2012-09-01

Really, it means I'm impressed, but the actual character means something much different.

~Meme~ (author)An Villain2012-10-04

Pls Dolan.

An Villain (author)~Meme~2012-10-05


~Meme~ (author)An Villain2012-10-06


An Villain (author)~Meme~2012-10-06
~Meme~ (author)An Villain2012-10-06


~Meme~ (author)Inventor X2012-10-04


hugamo67 (author)Inventor X2012-09-05

true story :P

Sharir1701 (author)2012-08-29

I don't have time at the moment to go through it all, but it looks good and I'm glad you finally posted it lol, after almost 9 months. 9 pounds is a pretty heavy baby... Lol. I'll look in more detail tomorrow, and then I'll be able to refer to the actual gun.

Oblivitus (author)Sharir17012012-08-29

Yes, 9 pounds would indeed be a heavy baby. All right, sounds good.

Sharir1701 (author)Oblivitus2012-09-03

Omg I'm so sorry I completely forgot about this... Sorry, but I was being bombarded with homework right on the start and didn't quite have much time. In that time, though, I did manage to finish up my project I was telling you about and it is looking awesome!!! I hope I will be able to post a video tomorrow. I also have some other video I promised kinetic I'll make, and an assessment I promised innovanna I'll make on his ible... I am very far behind schedule lol. I hope I can get it all done, but just so you know, don't be offended or surprised or anything...

Oblivitus (author)Sharir17012012-09-04

That's okay. I didn't remind you because I didn't want to nag. I just figured that if you remember than you remember. I look forward to seeing what you've been working on.

Sharir1701 (author)Oblivitus2012-09-04

i made a video, no pics yet, and posted a slideshow ible (pics to come), but instructables won't let me embed my video.

Oblivitus (author)Sharir17012012-09-05

Yeah, the embedding won't work for me either lately.

hugamo67 (author)Oblivitus2012-09-05

dam you must have a lot of k'nex. i couldn't build half that before i ran out

Oblivitus (author)hugamo672012-09-06

Yeah, I buy more from Ebay every once in a while. I buy like 10-20 pounds of it at a time for 30-60 dollars. I think 15 pounds is like 3 or 4 thousand parts. I also bought about 10 pounds from a yard sale for like $10 one time.

Sharir1701 (author)Oblivitus2012-09-27

alright, so for the first time in a while, i have TIME !!!! spare time, that is. i just looked through the instructable, and my suspicions have always been true. you made it unnecessarily massive. you could have made it so much smaller. for the most part, just slimming down areas that don't need any mech like the front and the stock is key. second, you could have had a much simpler much smaller trigger mech, i can see how, but it's not that important. except for that, this is a pretty impressive gun. are you trying to make up for something? lol no, but you have an ability to oversize everything beyond what is needed (SA 3252 reference. compare V.8.5 to S3), and you should try to work on making your stuff smaller in the future. sorry if my comment is a bit too criticisive, but we both know this is great. heavenlydistancebyduration (i ran out of words for the second part, so i thought i'd reference it with something else) !

Oblivitus (author)Sharir17012012-09-27

That's what she said (goes in corner and cries). Yes, yes, I know, massive stuff. Just an unfortunate by-product of my method of working. Don't worry, don't ever feel like you should cut your constructive criticism off. I can take any amount of criticism and I like environments that make me feel comfortable giving constructive criticism to others. Just make sure to balance criticism with some praise for the things that are working and ignore people if they can't take well meant and well put criticism. Just keep on talking whether they want you to or not. FlyingSpaghettiMonsterTimeAndSpaceForwardTraveling! (there's an actual official religion called "The Church Of The Flying Spaghetti Monster", look it up, it's a riot, made by free-thinkers and atheists)

PS. The word you are looking for is critical (there's no such word as criticisive).

Sharir1701 (author)Oblivitus2012-09-28

i don't get the that's what she said. i still claim you could make this a lot smaller pretty easily. the reason i didn't praise the gun in my comment was because you know the gun is great, and i've already said that on multiple occasions. also, i don't feel the need to be as polite with you as i would with any other person, since we have grown quite close.
aha. we need a new type of farewell. urgently. it's just sad what stupid people do these days, isn't it?

yes, i felt like criticisive wasn't the word, but i couldn't quite tell what was bothering me. thanks, anyway.

Oblivitus (author)Sharir17012012-09-28

Go back and re-read your comment for the that's what she said joke.

Sharir1701 (author)Oblivitus2012-09-28

i did. twice. still don't see it. if you're referring to the general idea of me saying it's too big, that's not funny, it has to come in context of me saying it in a way that would sound like a that's what she said, not just mentioning something is big.

Oblivitus (author)Sharir17012012-09-28

You asked if I was trying to make up for something.

Sharir1701 (author)Oblivitus2012-09-28

as far as i'm concerned, that's not a that's what she said. it's just a regular joke.

tytiger33 (author)2012-09-05

I'ma just gonna wait for the tech in this gun to trickle down to smaller guns.

Oblivitus (author)tytiger332012-09-06

Then take a look at Sharir's S3.

tytiger33 (author)Oblivitus2012-09-07

Already have it built.

Oblivitus (author)tytiger332012-09-07

Well that has a more advanced version of this tech.

PotatoCoffee (author)2012-09-02

Is it really posted, or is it a fake? (I still can't see very well)!

Oblivitus (author)PotatoCoffee2012-09-02

Lol, yes, as hard to believe as it is after all this time, it is really posted. And maybe you should get that eye looked at again!

PotatoCoffee (author)Oblivitus2012-09-03

Okay I see it now, wow great job!

Drew99-KGB (author)2012-08-30

I do not believe that a zombie eclipse or anything like that will ever happen, but if it does. My weapon of choice is right here!

Oblivitus (author)Drew99-KGB2012-08-30

Haha, all right. It would definitely intimidate them.

Drew99-KGB (author)Oblivitus2012-08-30

Oh yeah. But in all seriousness man. I haven't built it yet (workin on somethin) but this looks like an excellent gun. 5*

mulletman6 (author)2012-08-30

I have more than enough pieces to make this ... shame they are all "tied up" in other guns and models :/

About This Instructable




Bio: I paint, write music, and used to build knex guns. I have a Bachelor's Degree in Studio Art. - updated 5/7/2014
More by Oblivitus:Z3 Knex Gun (3-Barreled Semi-Auto Pump Action Revolver)Z3 Knex GunZ3 Knex Gun Firing Demonstration
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