How to Make a Spring Powered Paintball Gun

In this Instructable, I will show you how to make a spring powered gun that can shoot paintballs, rocks, etc.
**I TAKE NO RESPONSIBILITY FOR WHAT YOU DO WITH THE INFORMATION PROVIDED IN THIS INSTRUCTABLE**

5 foot piece of PVC (3/4 inch)
1 foot piece of PVC (1/2 inch)
PVC cutter or Hacksaw
3/4 inch T Joint
3/4 inch end caps (x3)
Strong, long spring (see picture)
Stubby, weak spring (see picture)
Balsa wood (or Bass, Poplar, etc.)
Electrical tape
Drill+ Bits
Chisel
Nail (one only)
Airsoft 20mm rails (Optional)
Airsoft Red Dot Scope (Optional)

Cut the 3/4 inch PVC to the following lengths-
Barrel- 45 cm (or whatever length you want it to be)
Magazine- The length of your SHORT spring minus 0.5 cm.
Stock- Length of your LONG spring plus 2.5 cm

Cut the 1/2 inch PVC-
Piston- 6 cm

1. To make the magazine, Cap the previously cut PVC.
2. Cut your wood into a Circle that will fit into the PVC snugly.
3. Tape the wood to the top of the spring.
4. Insert the spring into the magazine, wood on top.

1. Tape the "Piston" (1/2 inch PVC) to the Long spring.
2. Drill a hole all the way through the bottom of the piston (see picture).
BE SURE TO PUT FOAM/SOMETHING SOFT ON THE TOP, SO IT DOESN'T BREAK THE PAINTBALL IN THE BARREL.

First, draw your grove (for the nail to stick out of)
Then, draw the notch (to lock the spring back.)
I have 2 notches, one for hight velocity and the other for medium velocity.
Depending on the strength of your spring, the size of your groove will vary.

Now, here is the hard part- cutting out the groove.
I drilled it out and then cleaned it with a chisel (Picture 2), instead of cutting it (it was much easier).

Then, drill a Large hole in the back (Picture 3).
Now, put the spring with the piston into the stock.
Push it down a little bit and push the nail through the hole and the hole in the piston (Picture 4).
Picture 5 is the final result (of the Stock).

Now, reassemble the gun and, you're ready to go.