Introduction: SIHM-2

Picture of SIHM-2

This is the SIHM-2. My first ever horizontal mag gun I have posted. And this isn't just any horizontal mag gun. It has a never before seen way of loading bullets into a chamber utilizing this type of magazine. The gun is also one of the most compact guns of it's kind I've ever seen. Because Horizontal mags are harder to implement into a gun than typical vertical mags, the knex community doesn't have many guns with a magazine like this.

The magazine holds eight green/black rods. It is removable and is gravity fed in a sense. When you attach a magazine, the bullets aren't automatically loaded into the barrel. It must be done manually. The way you do it ensures that there isn't hardly any friction on the bullet so maximum power is achieved with a green rod. The low friction barrel inside makes sure that the bullet isn't slowed down any and achieves great accuracy. 

Because it is a green rod shooting gun this gun is not intended for outdoor use. If you would really like, a grey connector shooting version of this gun wouldn't be hard to make, but it would have a lot less capacity, about 5 rounds.

So the way you load bullets is by pulling back the pin, tilting the gun back a little, pulling down the "mag push" until you see a green rod slide onto the top of the mag push. You then proceed to push it up, loading a bullet into the chamber. To shoot you pull the trigger quickly. 

Range is around 45 feet, but again, it is not intended for outdoor use, as green rods are hard to find outside.

That's pretty much it, guys. This gun is a new kind of gun, and I would really love it if someone built it and gave me some feedback on it! This is one of my favourite guns I've ever made. This new idea can also be used with bigger magazines, and bigger guns. A stock would also work with this gun.

This gun is also loosely based on the "PP90M1"

Please leave a comment and tell me what you think! Is this a bad idea, a good idea? Should it be changed somehow? What other guns could I implement this idea into? Comments help me out a lot, guys.

If you build it, tell me what you think!!!! (This gun uses 3 broken orange connectors. One has to be sanded down to a certain length.)

Step 1: Magazine

Picture of Magazine

We will be making the magazine first. If you want, build two! 

Step 2: Handle

Picture of Handle

The Handle.... The part of the gun that you hold.

Step 3: Body + Attaching Handle

Picture of Body + Attaching Handle

Here we will make the body and attach the handle.

Step 4: BREAK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!11!!1

Picture of BREAK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!11!!1

I've been forgetting to put breaks in some of my recent instructables, but I remembered this time! 

This time you can just sit back, relax, and play some video games.... Your choice of system ;)

Step 5: More of the Body..

Picture of More of the Body..

We will continue to make the body of the gun. 

Step 6: Check and See If the Mag Works

Picture of Check and See If the Mag Works

We are just going to see if the magazine attaches properly, and doesn't mess the gun up all.

Step 7: The Rest of the Gun (finally)

Picture of The Rest of the Gun (finally)

We are FINALLY going to make the rest of the gun.

Step 8: Rubber Bands and Loading/Shooting

Picture of Rubber Bands and Loading/Shooting

Here is the last of it. If you need more explanation, please ask me :D


soccer9112 (author)2013-04-03

did any one take a break

OZKNEX22 (author)2012-12-27

This is sick.I'm going to build right now.5* Well done. Its awesome. :D

Elemental314 (author)2012-09-21

That is freakin' awesome!!!!!! LOL :D
U should make a youtube video and show how hard it shoots and stuff. PLZ!!!
This is so good it won a contest, so this must be PRETTY epic! :D

gassybeans (author)2012-09-16

Do you mind if I take the mag and make a PPOM-1??

Seleziona (author)gassybeans2012-09-16

Not at all! Just give me little credit :)

gassybeans (author)Seleziona2012-09-18

cool..... got the outer frames, and firng mech..... maybe next week It will be finished...... :) Oh, and of course, the mag is done, with slight tweaks.... made the bullets smaller.

chacha2013 (author)2012-09-14

thanks man, i've built it and im going to see if i can mod it too shoot my bullets or white rods

~Meme~ (author)2012-04-21


Seleziona (author)~Meme~2012-05-10


~Meme~ (author)Seleziona2012-05-10


MontyP113 (author)2012-04-28

this is the horizontal version, the gray circles are white pegs turned on their sides, i tried to keep it as visually accurate as possible. red part is the hammer, THE HAMMER MUST REMAIN COCKED BACK AT ALL TIMES. this excludes when the trigger is being pulled. rubber bands are on the exterior. interior is only shown

MontyP113 (author)2012-04-28

I believe i have figured out how to make the pistol semi-auto with a horizontal mag.
Note- i realize this post may be a bit late I will add the photo in next post
The gist
The horizontal mag is above the gun, like that of a p-90. The mag empties into the chamber at the end of the mag. The mag is constructed so that two of the green connectors can sit on top of one another. The mag has a ram-rod at the front which moves up as both of the green connectors are fired. NOTE the chamber should be as smooth as possible. The ramrod is pulled forward with 3 rubber bands per peg, twined in a double helix for lessening of jamming.
TRIGGER MECH- this is simple. the trigger itself exists between the sides of the gun. NOTE the gun at the trigger and chamber should be 3 yellow connectors placed side-by-side across. the trigger is pushed back into place with by means of the rubber bands, ten for this to ensure maximum force is exerted on the piece that actually fires the gun. it should be shaped the same as it is on a real gun.
I do not have my Knex so i can unfortunately not build this, i hope that you may

MontyP113 (author)MontyP1132012-04-28

i meant vertical, though with a few corrections, it will be horizontal

~Meme~ (author)2012-04-20


The Cannoneer (author)2011-12-20

in the second last pis does the piece need 2 be broken

~Meme~ (author)The Cannoneer2012-04-20


omnommaster (author)2012-02-12

i like halo reach on xbox

~Meme~ (author)omnommaster2012-04-20

Yes, as do I.

the_boss_builder (author)2012-03-29

step 5 pic 7 stupid camra blur hate it wen dat happens

omnommaster (author)2012-02-12


TheDunkis (author)2011-09-17

I have to admit, I was kinda disappointed when I learned it was a manual loader. And the way you did the magazine was also kind of bleh. I'm all for in-line stored ammo but the magazine is much thicker than it needs to be then. Or you could have stored the ammo paralleled like a regular magazine and figured out how to rotate them so that you could have a higher capacity magazine. Either would've been great, but there's wasted space on the magazine on the moment.

Other than those, it's a great looking gun. We're in severe lack of horizontal magazine guns.

Seleziona (author)TheDunkis2011-09-17

I was a little disappointed too that it was manual loading, however funny that must seem. I just couldn't find a way to keep the gun small and good looking without some gigantic part to auto load it. For it to be auto loaded the gun would not be the same at all. It may be a little better, but it'd be a gigantic piece waster. And I don't understand what you meant be "the magazine is much thicker than it needs to be." The magazine is three connectors thick, as small as it can possibly made.

I do like your idea for a higher capacity magazine, but I don't see it happening in any of my guns any time soon. I've tried stuff like that, it never EVER works. I've tried at least ten times in the past to find a way to rotate bullets being a sort of ramp or a mechanism, it just never works.

Thanks anyways. I do agree that more people should try to make horizontal magazine guns.

TheDunkis (author)Seleziona2011-09-18

I meant in height, I should've clarified on that. It's a block construction when you're using a "tubular" style magazine front to back as opposed to side by side ammo. For that, you should've tried making something that was only as tall as a rod barrel. It's what I attempted to do with that P90 magazine I made a while ago. Otherwise it's making the gun a lot larger than it needs to be. Should see if you can make a third version and try a flatter magazine and also give another go at making it autoload. Or, if you can't, then try the side by side high capacity magazine and make the manual loader rotate it for you some how.

Seleziona (author)TheDunkis2011-09-18

Ahhhh, okay. Now I see. Thanks for clearing it up. I think I will try another autoloading version with a magazine like this after I attempt at making a PDR. It should work good.

JoeyHersh (author)Seleziona2011-11-05

when you're done working on a auto - loading gun, can you post instructions? also try making a sling - shot type gun, very good distince but bad accuracy though... please reply

Seleziona (author)JoeyHersh2011-11-08

Actually, I'm working on something else right now. It will be up soon.

JoeyHersh (author)Seleziona2011-11-11

Ok thats good. by the way i made my first instructable!!!!!! its a limousine.

Vynash (author)2011-11-04

This is amazing! 5* and favorite :D

Seleziona (author)Vynash2011-11-05

Thanks :D

Vynash (author)Seleziona2011-11-05

No problem :D

epicbobman52 (author)2011-10-20

you should use this design to make a P90 ( you know because of the horizontal mag :D)

Seleziona (author)epicbobman522011-10-21

I thought about that.. I don't know though

dr. richtofen (author)Seleziona2011-11-01

i think it would be pretty easy, drawing some sort of design out in paint, so you could see what i mean

Seleziona (author)dr. richtofen2011-11-01

yeah, maybe

dr. richtofen (author)Seleziona2011-11-01


dr. richtofen (author)Seleziona2011-11-01

here's my design for your mag in a p90:

the mag pusher pushes the bullet to the mag wall, so it doesn't drop. When you cock the gun, the mag pusher moves with it to the back, so the bullet drops. i hope
you get it.

epicbobman52 (author)Seleziona2011-10-21

i just thought it would be cool :P

albydesign (author)2011-10-26

Awesome! could you use a grey connector instead of sanding down an orange connector?

Seleziona (author)albydesign2011-10-27

Nope. All of the modded orange connectors are intentional and have to be there.

Seleziona (author)2011-10-14

Yeh, why?

Johnhall44 (author)2011-10-12


FlutterTree (author)2011-09-22

Good gun, and furthermore a good idea, I like guns like this more than k'nex snipers and some assault rifles.

mulletman6 (author)2011-09-17

Debating on making it .... hmmm ...

Seleziona (author)mulletman62011-09-17

... hmmmmmmmmmmmmm.....

mulletman6 (author)Seleziona2011-09-18

Shal have to leave it for the mo as i've been waiting for the new crawler crane to be posted and it finally has been. Will see how many bits i have left after that and then if i have enough, will make this then :)

Seleziona (author)mulletman62011-09-18

Cool :D

altair ibn la ahad (author)2011-09-17

wooooooooooot mw3 beta testing suckers

lol :P

altair ibn la ahad (author)2011-09-17

love it

Thanks :)

About This Instructable




Bio: My name is Daniel, I am a computer engineering student. Cooking and baking are my passion, sharing the knowledge that absolutely anyone can cook outstanding ... More »
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