Semi-automatic 7 Shot Knex Rifle




About: Some kid that likes creating things or viewing them to see the science behind them.

A semi-automatic knex rifle with 7shot bottom loading magazine that has a very powerful shot, but a long loading time.

Step 1: Make the Barrel

Pretty simple. Look at the picture.

Step 2: Make the Stock

Also simple. Look at pictures

Step 3: Make the Trigger and Firing Device

Step 4: Make the Magazine

1)Make this
2)Make this
3)Add this to step 1
4)Then add this to steps 1+3
5)Like this
6-8)Add step 2 to steps 1,3,4 so that the yellow is pointing away from step 4.
9)Add blue supports
10)Then add the bullet support system

Step 5: Make the Connector

Simple. Just make this.(the red is held by a green attached to it.)

Step 6: Connect

Connect 4 to 5 1 to 4 5 to 3 3 to 2
To get this

Step 7: Loading

1)Take these greens off
2)Take of these 3 rods
3)Got 7 heavy rubber bands and 2 weaker ones?
4)Take one of those heavy rubber bands and stretch it from the wheel to the front of the gun then rotate the wheel backwards until it clicks
4a)Repeat 6 more times then make sure the rubber bands are inside between the white connectors
5)Add the blue rods back
6)load the bullets so the orange is toward the back on the gun load between 2-3 bullets per time until you get 7 into the magazine.
7)Add the mag (spring) and yellow rods back
8-9)Add those 2 weaker rubber bands to the spring
10)It should look like this, but with 6 more rubber bands
11)Your ready to fire, have fun but don't shoot your eye out

Step 8: Credits

Thanks Beddbug2 for the first rbg that shoot bullets



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    214 Discussions


    Reply 8 years ago on Introduction

    i built this a while back, loaded... 8 shots lol, and shot it, fired full auto cause the trigger couldnt catch the ratchet thing. its a decent gun being a semi auto slingshot rifle...


    9 years ago on Introduction

    holy fudge i just loaded the rubberbands and pressed triger then the thing xploded in my eye!

    3 replies

    Reply 9 years ago on Introduction

    lol that med me laugh as i was scanning thru comments and i red urs and u med me laugh sos for laughin at ur pain.... r u ok?


    9 years ago on Introduction

    Seeing all the comments about how it explodes makes me want to make it just to see it explode. :D

    1 reply

    Reply 9 years ago on Introduction

     it's kinda like being poked in the eye with a sharp stick.

    it's kinda funny but hurts like hell.


    9 years ago on Introduction

    ouch -.- the snowflake that holds the bands just exploded. it's a self destructing k'nex gun!

    4 replies
    An Villaincerj

    Reply 9 years ago on Introduction

    i know the feeling, i once fired the entire snowflake with the white rods on, RAZOR RIFLE!!!!!!!!!!!!!!!!

    An Villaincerj

    Reply 9 years ago on Introduction

    i know, same thing happened with bunduk's semi auto RBG pistol, except i launched the Mechanism, barrel, trigger, and supports. all i had left was the handle.