Knex Handheld Break Trigger Railgun/sling Shot

this is my first instructable hope  u enjoy
pros:
long ranged 
quite good accuracy
reliable 
powerful
doesn't use many pieces 
 cons:
no sight (you have to use the ammo)
flexes down the barrel

pieces:
rods:
green 46
 white 17
blue 1
yellow 6

connectors:
1 ended grey 3
2 ended grey 4
orange 13
green 8
yellow 36
brown tan 4
black 2

ruber bands

Step 1: Handle and Trigger Mech

pieces:
rods:
green 14
white 16
yellow 2 

connectors:
1 ended grey 1
orange 2
green 4
yellow 16
tan 4

Step 2: The Rail/barrel and Secondary Handle

pieces:
rods:
green 34
white 13
yellow 4

connectors:
orange 11
green 4 
yellow 20
black 3

Step 3: Propulsion

pieces:
rods:
blue 1

connectors:
1 ended grey 2
black 1 

ruberbands

Step 4: Finnishing the Gun

parts from steps:
1
2
3

Step 5: Ammo and Loading

i didn't include these in the 1st step 
pieces: 
rods 
grey 1

connectors
yellow 1


if you want i can uplaod a way to make a second trigger onto the second handle