How to Make a Spring Powered Paintball Gun

About: Young and creative kid turned mechanical engineering student at University of Pittsburgh. All posts here were posted when I was in highschool. New projects coming this summer.

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**

Step 1: Materials

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)

Step 2: Body Assembly

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

Step 3: Magazine

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.

Step 4: Operating Spring

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.

Step 5: Stock

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).

Step 6: End

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

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    20 Discussions

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    shorty89

    3 years ago

    I actually did this in reverse order. I was at ACE, wondering what I might need for my next project and I found sooo many springs! So obviously, I bought over $30 just in springs :D . I've always wanted to do a spring-powered project, but salvaging them out of pens is always a hassle because they're rarely standard. Thanks for the instructable, now I get to use my springs!

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    hobbitboyPhilbil

    Reply 7 years ago on Introduction

    I got mine frome 2 nerf recons By the way i used the lighets from the recon and made mine into a nerf snipir but can double as a airsoft bazzoka
    Skaterqwertyuiop awsome ible

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    hobbitboytemp

    Reply 7 years ago on Introduction

    if you look at the metal denting version by camdav32 it has a triger and is very similare to this one

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    dkop1

    8 years ago on Introduction

    wow, sounds like one BA project for a few hours on a Saturday.

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    EmmettOskaterqwertyuiop

    Reply 8 years ago on Step 6

    So what's the best range you've gotten out of this set up? Not how far the paintball will go, how far away can you fire and actually mark a target?

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    skaterqwertyuiopEmmettO

    Reply 8 years ago on Step 6

    Sorry, but I have never used it in a match or even for long range target practice (I've been successful for 50ft, but haven't tried further). It also depends on the spring, etc. as stated above.

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    EmmettOskaterqwertyuiop

    Reply 8 years ago on Step 6

    Not bad for a spring! I would have thought you would have to pull it back further than the four or five inches to get a really good push. In addition to paintballs, this could also work with nerf microdarts. I think the regular ones would just mush in the barrel.

     Nice stuff! i thought about this and figured id try so i searched it and ive been using yours as a general guide! Thanks! subscribe to me and ill have some pics of it up soon!

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    samdaman

    9 years ago on Step 6

    did it cost much to make and where can i get the scope from. nice job by the way

    1 reply

    Oh, if you plan on making it, be sure to put a blow dampener (like a cottonball) on the end of the piston, so it doesn't break the paintballs in the barrel.