K'Nex Semi-Auto




This is a gun I made in my free time, and my new hobby is making harmless and useless weapons from household junk. My first one is my K'Nex 3 round semi-automatic rubber band shooter. NOTE: this is a prototype! I know i can make it better so please leave your comments and pictures!

Step 1: Create the Frame

Look at the pictures to figure out how to make the shooting frame thing

Step 2: Make the Handle

Again, look at the pictures.

Step 3: Connect the Two

Pictures, pictures

Step 4: Conect the Two Frames

Use blue sticks to connect the frames. Look at ALL of the pictures in this step if you want to do it right.

Step 5: Make the Barrel

I forgot this step...

Step 6: Connect the Barrel


Step 7: Add These Cool Things.

These things just look cool

Step 8: The Hook

Add the hook, look at the pictues.

Step 9: Loading the Gun

Place the rubber band on the hook and pull back and under the frame. Hook the first rubber band on the second barrel thing. Then load the second one on the first hook of the barrel

Step 10: Shooting

Basically, hold the hooks until you want to shoot. To shoot one, release the hook and put your finger back on the second one. To fire the next one, let go.



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    71 Discussions


    This is almost 7 years old, so of course it's not as good as todays guns. Back in 2006, it was one of the first k'nex guns, so don't call it a piece of junk.

    Inventor Xluke11wolf

    Reply 7 years ago on Introduction

    Please reconsider your statement, because this was made back in 2006, where innovation was just beginning with the subject of Knex. It developed over years into greater weapons we know today, but this is like one of the original guns made out of Knex that actually work..


    7 years ago on Step 10

    It's a good model but loading it takes like a minute.

    Knex Lego Maniac

    12 years ago

    Check out my gun made w/ K’nex watch the vid on step#18 2 c it shoot my sniper rod 200ft. this children’s toy is no longer a toy search keyword Knex Gun

    5 replies
    skwuruldisco diva

    Reply 11 years ago on Introduction

    No. You WILL injure someone really badly/kill them if you fire KillerK's gun at a person.