Picture of K'nex Gun
Single shot, highly accurate k'nex pistol. Easily modified, simple to fire, fires around 50 FPS with a blue rod and two normal sized rubber bands.
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Step 1: Gather Parts

Picture of Gather Parts
4 Green Rods
5 White Rods
7 Blue Rods
1 Yellow Rod (Optional)
3 Red Rods
2 Grey Rods

17 Grey Connectors (1 Clip)
9 Light Grey Connectors (2 Clip)
11 Red Connectors
3 Yellow Connectors
1 White Connector
1 Black Connector (Picture Below)

4 Blue Spacers
2 Grey Spacers

3 Rubber Bands

Step 2: Construct Handle

Picture of Construct Handle

Step 3: Construct Trigger

Picture of Construct Trigger
Trigger Assembly.JPG

Step 4: Brace Trigger

Picture of Brace Trigger
Bracing Assembly.JPG

Step 5: Construct Barrel

Picture of Construct Barrel
Barrel Merger.JPG
Barrel Assembly.JPG
Barrel Assembly Close-Up.JPG

Step 6: Construct Firing Ram

Picture of Construct Firing Ram
Firing Ram Assembly.JPG
Firing Ram Assembly Close-Up.JPG

Step 7: Add Rubber Bands

Picture of Add Rubber Bands
Aerial Rubber Band Placement.JPG
Safety Rubber Band.JPG
Aerial Safety Rubber Band.JPG
For best results, use rubber bands with 5.25" circumference and 1/16" width. The dark blue rubber bands power the firing ram. The light blue rubber band is the safety; when the ram is pulled back far enough, it will pull a red piece into the firing ram's path, preventing it from moving.

Step 8: Loading and Firing

Picture of Loading and Firing
Loading Gun.JPG
Ramming Down Ammo.JPG
Push to Fire.JPG
Cocking Gun.JPG
To cock the gun, pull back on the firing ram until the safety clicks into place; if you let go, the firing ram should stay in place.

Next, insert you ammunition down the front of the barrel. You may want to keep a grey rod around to ram the ammo in all the way. Finally, to fire push the blue rod on the left side in towards the gun, and say goodbye to your target.

Step 9: Mods

Picture of Mods
Hand Grip.JPG
6 Point Mount.JPG
6 Point Mount Connection Points.JPG
This gun can be easily modified. All connectors on the barrel can be swapped for other parts ( Take the first picture, for example), but it's a good idea to avoid space between the pieces, thereby avoiding making joints for the rod to wobble in. Also, I put a hand grip on the yellow connector in front, and am considering adding a "bayonet" through the red connectors in the front. I didn't give instructions for it, but if you want to put a clip on the back of the gun, I have provided a picture. Finally, I have given pictures of how I mount the gun to test distance and speed.

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Rudy39832 months ago

in the items needed list it says picture below; when it should be picture above.

irongiant924 years ago
it's not very sturdy, but it is a good idea.
You know fps stands for feet per second and is a measure of speed not distance =P
i thought fps was frames per second on computer screens and stuff
tytnium (author)  Fred the Penguin6 years ago
yes, I am aware of this. i want to let any potential builder know that this is not the strongest of guns, and chose to use speed instead of range.
You know 50 feet per second is pretty fast its something like 60kph or 40mph which I'm not sure how you measured
I measure by shooting at a wall, or anything that makes a noise for that matter, and keep changing the distance untill it takes one second to hear the noise of it hitting, then measuring out that distance, for instance, my killerk magnum shoots at 65fps. I did this by shooting the gerage door, and well, you can figure out the rest. (yes I am aware your post is sevral months old now)
LOL, I just singned up to say that the guns u guys make are cool but some of you are way to upsessed, you all need to find somthing else to do with your spare time (and this is coming from a 13 year-old)
i like to make my own video games in my spare time!!
i do that with a program i downloaded go to and download the gamemaker 7.0 or the latest version then use the tutorials to get oriented
bunduk Mepain8 years ago
hey I like doin' that to Ive made quiet a few now with HTML and stuff.
post an instructable cause my webbie sucks!
i taught myself from books
This is coming from a 14 year old. This may be an obsessive hobby, but it's good for your creative thinking.
yes, yes it is. knex is the best creative thinking improver!
Really? With grammar and spelling like that, I'd expect you to be about 8 or 9 years old...
zap89 Trogador7 years ago
pwnage oh yah
lol you guys are so mean...
lol I've been working on my spelling and grammar. (as you can see from previous comments my spelling and such sucked) By the way nice comeback(reply? whichever you prefer)
aall50 Trogador7 years ago
you meane
r3tardeded6 years ago
i say they should ban every single block trigger gun and "simple but powerful" knex gun!
has it a true trigger
jli17 years ago
doubt it can shoot 50 fps
popomaster jli17 years ago
50 fps isnt that fast just to let you know.
I liked it but doesnt shoot very far maybe ehhhhhhhh.. 27ft.... but over all nice pics simple cool gun
thats a funny gun man!
F-zero8 years ago
This is fun, I put double rubber bands on the firing pin and add more pieces past the safety for extra stability. I didn't have many single greys available so i just used orange connectors. I like the trigger system, much better than I could have done, haha.
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CALM DOWN!!!!!!!!!!!!!!!!!! if you are not interested in contributing to the knex section of the site then just go away and knex is not for 'kids' it is a enigineering product that is safe and fun to use. so if you dont want to join in the fun but instead moan then do what ever you want to do and leave use to enjoy ourselves
no knex is for kids but if adults have nothign else to do or want a hobby then its ok :P
yes i agree
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there are way more than 20 people but like you said they dont make accounts, and like i said if you dont have anything constructive to say but instead just MOAN then just comment somewhere else or just GO!!!!
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my god slingshots are even worse you fool
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there are already many types of knex guns that delivers more energy, and sling shots aren't always accruate
what is your problem???!!!
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