Introduction: How to Make Mr. Doomsday

Picture of How to Make Mr. Doomsday

Hey Everyone,
Most of you have heard of Mr. Doomsday. Now you can build it for yourself. 
Mr. Doomsday is a single shot pistol that can shoot any rod (sniper rods included), Oodammo, and gray clips. It gets 60 - 65 feet with Oodammo, and about 45 - 50 feet with gray clips. Those ranges are with 2 64# bands. It has a bullet lock, and a nice handle that uses no black wheels. Also unlike my other guns this uses no cut parts. 

I'm sorry if the instructions are bad. This is only my 22 instructable. lol
Let me know what you think. It only takes a few seconds.
Don't forget to:

Step 1: Part Count.

Picture of Part Count.

White: 4
yellow: 16
green: 8
red: 6
light gray: 5
orange: 5
gray: 1

Gray/black: 1 (Use black if you can.)
yellow: 1
blue: 1
white: 25
green: 55

Odds and Ends:
y connectors: 13
ball joints: 6
tan clips: 2
blue clips: 2
back & blue hinge: 1

Step 2: Step 1

Picture of Step 1

Picture 1: Build
Picture 2: Add gray/white rods
Picture 3: Build this
Picture 4: Add it on to the rods
Picture 5: Build
Picture 6: Add it on
Picture 7: Make this guy
Picture 8: And snap it in.

Step 3: Step 2

Picture of Step 2

Picture 1: Make this.
Picture 2: Then add the white rods.
Picture 3: Build these
Picture 4: And add them to the panel.


Step 4: Step 3

Picture of Step 3

Picture 1: Build these parts
Picture 2: Add them on
Picture 3: Add this green rod

Step 5: Step 4

Picture of Step 4

Picture 1: Build this
Picture 2: Add it to the side.

Step 6: Step 5

Picture of Step 5

Picture 1: Add the handle
Picture 2: Make this
Picture 3: And add it on.

Step 7: Step 6

Picture of Step 6

Picture 1: Build these
Picture 2: Then add them to the handle
Picture 3: Get these rubber bands. 
Picture 4: Add the band to the trigger
Picture 5: Add the band to the bullet lock.

Step 8: Step 7

Picture of Step 7

Picture 1: Make this.
Picture 2: Slide them together
Picture 3: Tape it up good.
Picture 4: Put it in the gun.
Picture 5: and put the bands on.

Step 9: Step 8

Picture of Step 8

To fire, pull the ram back and slide the ammo in the end of the gun. Pull the trigger and there you go.

Step 10: You're Done.

Picture of You're Done.

You're done!!

Let me know what you think. Also don't forget to:


silentassasin21 (author)2009-12-05

Wow with 4 64's that thing hurts like no one buisness

Yup, that's one thing I like about it. :-)

Left a huge welt on my cousin moowahahah.

Woh. I'd be interested in doing the same thing. XD What rubberband(s) size and amount did you use?


thats fun to type!!!! MOOWAHAHAHAAAA!!!!!!!!

That's nice....

The Knex Inventor made it! (author)2016-06-04

Nice pistol! The only problem that I had was that if you dry-fired the gun (shot it without inserting ammo first) the bullet lock would fly off. Still, a great gun!

Skye-R (author)2015-07-16

Awesome. I added a a silencer to mine

turdus_migratus (author)2013-10-20

yes post it (if it has good range :D)

h3nkp00nz0r (author)2012-02-21

I made a oodammo mag for this pistol, works great, no jam and no double shots; Should I post it?

~Meme~ (author)h3nkp00nz0r2012-04-04

Me gusta

h3nkp00nz0r (author)~Meme~2012-04-04

I guess that's a yes? After easter i'll get on it ;)

~Meme~ (author)h3nkp00nz0r2012-04-04

Thanks, do you read meme too?

h3nkp00nz0r (author)~Meme~2012-04-06

When does the narwhal bacon?

~Meme~ (author)h3nkp00nz0r2012-04-06

At midnight.

h3nkp00nz0r (author)~Meme~2012-04-06


~Meme~ (author)h3nkp00nz0r2012-04-06


k-n-e-x(leaved ibls) (author)2011-01-14

how can i make the ammo don't fall out?

NatNoBrains (author)2011-01-02

See my slide show for a red dot sight mod!

The Jamalam (author)2009-12-08

Hmm. Reminds me of the ZLG. But it does have a different trigger.

Different trigger and it shoots ten times better. The ZLG only got 20 feet or so.

really good best oodammo gun eva, idea: make the handle into a grey clip mag, but make it so you can shoot the gray clips and if you want you can put in a oodamoo

 REALLY?? not for me..... i had great success!! hell i even made an awesome mod and posted it as a new gun!

Really? I got it to go 70 feet.

Mine got around 30 or 40. I like this better, though.

~Z~ (author)Raikou-san2009-12-09

Mine got around 50-60......

~Z~ (author)~Z~2009-12-21

Wow...I built another ZLG and found out That I missed a part on my 1st one... But the weird thing is that the one with the part shoots much weaker....

Make sure you don't have too strong of bands on the bullet lock.

 I'm testing my disposable ammo with this, lets hope it shoots further....

What are you using for ammo??

 The paper ammo I made, no one even dared to look at it for a long time. It does have very good potential. Good 50 feet on this gun. 5* and...oh wait I already subbed.

Can you post a picture of it?

 I found out I can take pictures on my webcam...My built in
here's the picture. I need a video to show 50 feet. That might come in roughly next week. And besides, I haven't been active in a while...

 I'll post a vid of me shooting my ammo with this gun tomorrow maybe.

paper lame huh

knex_mepalm (author)knexfan91822009-12-18

My paper ammo?

Nice how you fixed it up.
good job, 4.5*.

KNEXFRANTIC (author)2010-03-10

nice but in my opinion i think it would be infinatly improved with a mag

knexsuperbuilderfreak (author)2009-12-05


Cool, Let me know how it goes.

=O this gun is amazing!!!!!!! best oodammo single shot ever!!!!!(that ive made)5* and fav


it was the only oodammo single shot at the time


Can you post a review of it??

May i make a review?

Sure, if you wanna.

I will see if i have time.
I think i will be making a video with it too. (I maybe say anything wrong because i am not English.)

About This Instructable




Bio: Im Killer~SafeCracker, I started using Instructables in 2009. I mainly post in the Knex world, but I venture out sometimes. Check out all my ... More »
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