Instructables
Picture of NXT auto/semi-auto rubberband gun

This is for 12 and under devision
So i have decided to make a very cool gun. This may or may not hurt depending. Please don't point at eyes or intentionally trying to hurt people.

 
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Step 1: What you need

Picture of What you need

1 mindstorm engine and the controler item (Scene in the upper right of the picture)
2 gears
2 elbow pieces
2 L shape pecies
4 15 doted pieces
4 round connectors
4 round + cross pieces
2 round extra long pieces
1 long cross stick
 

Step 2: STEP 1

Picture of STEP 1
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Connect white pieces togather. put it four down the row. Do the same to the other two.

Step 3: Title this SteSTEP 3

Picture of Title this SteSTEP 3
Add the extra long round pieces to the engine

Step 4: Step 4

Picture of Step 4
now add both of the white or whatever color to the engine

Step 5: Step 5

Picture of Step 5
Now put the long cross stick sthing in the middle of the orange piece of the motor and add a gear to each side of it

Step 6: Step 6

Picture of Step 6
attach the both of the blue pieces to the elbow shape piece and put in the end of the barrel type thing. i glued mine in because it kept moving.

Step 7: 7

take an L piece and put a round connector and put in were the long piece with holes intersects with each other

Step 8: Step 8

this is the simplest step to program. you just drag a move box in and thats really it.

Step 9: LOAD

to load you simply just get a rubberband and put it over the blue round piece and the gear and click the button and it will shoot