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June 7th, 2012

A fancy PVC air gun

I have been looking into making “Airsoft” guns, an interest I got from my grandson Ethan (who made an impressive gun of his own.) As I checked things out, I found guns that had bigger bore and shot darts, marbles and other “ammunition.”

It would be fun to make a little more serious PVC gun. Some are even using them to hunt small game.

The biggest problem seems to be the trigger. It must be able to contain air under high pressure, and release it very quickly. One inexpensive “trigger” uses a ball valve (show to the left.) To fire the gun, the user must move his hand up to the valve and quickly twist the valve open. This motion tends to jerk the gun, impacting the aim. I found a gun with an actual trigger that releases a spring that flips the valve. Could work.

The gun in the picture in this post uses a sprinkler valve. This approach is touted as being effective. But the added complexity to integrate it and the cost (about $30) makes it less then appealing to me.

So, how about some ideas???? Surely there is some way to make a simple, inexpensive trigger. Once we come up with it we can explore all kinds of fun air guns.


Here is the plans for the gun above: 25MM AIR GUN PLANS

Post your ideas here…



  • Jason Garber says on: June 7, 2012 at 9:24 pm


    Hi Mery,

    I’ve considered this on a larger scale for several years. The fastest way to let the air flow would be with a solenoid valve, but from my looking around, they are (a) expensive, and (b) require a power source.

    To mitigate this problem, I’ve conceived a small mechanism which would use a trigger, cocking mechanism, a spring, a quarter turn ball valve (trimmed), and a case to keep it safe. Pulling the trigger would unleash the spring force, completely opening the quarter turn ball valve almost instantly.

    Do you have any interest in a solid works model?


    • mupdyke says on: June 7, 2012 at 10:08 pm


      That sounds like it would work. Have you put one in an air gun? And can the sw model be exported to Sketchup? Or saved to bitmap? Would love to post it!

  • sammy says on: August 16, 2013 at 6:23 pm


    use nail gun trigger part

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