How To Build A Breech Loading Spudgun
This launcher is pretty cool. It's design and look alone is intriguing and
intimidating enough to give any potato the willies. It operates like any other pneumatic
Air Cannon Spud Guns, except this is built to simulate a
rifle. Air flows through the angled stock, from a chamber underneath the barrel. A breech loader
has been added for ease of loading projectiles.
The concept for this gun came from Xinventions. The following design is my
adaptation and advancement of the previous design.
A PVC sniper rifle like this can be used in Airsoft games or perhaps even paintball. The idea here
would be to use paintball grenades or sabots to launch from the spudgun. In an Airsoft game, you
can use the pneumatic air cannon / spudgun to launch anything
from marshmallows, small fruit, water, or potatoes.
MATERIALS
Pipe can be bought in 5' sections.
3/4" Pipe
1" Pipe
2" Pipe
3/4" 90 deg. Elbow x3
3/4" 45 deg. Elbow x6
3/4" Tee x2
3/4" to 1" Male thread
1" to 3/4" Bushing
1" to Female thread
1" to Male thread
2" x 1" Bushing
2" Coupling
2" Endcap
Tire Valve
1" RainBird In-line solenoid sprinkler valve
ALL PIPE IS SCH 40! DO NOT USE DWV PIPE!
ASSEMBLY
The stock assembly is the main part of the gun. I cannot give you accurate
measurements, as I built it to fit my large physical profile. I will post better measurements when
I find my schematics again. Stoppers (pictured above) are not necessary. Don't worry about them.
Simply glue the stock pieces as shown. Feel free to change the position/length of the stock and
handle to suit you.
I made the chamber 2' 6". This allowed for ample volume while maintaining a low profile. Great
volume is not so necessary in this gun, as you are shooting smaller, lighter projectiles (not large
potatoes, although with another barrel you could).
For construction of the breech loading mechanism, please see the breech loader mod page.
Construction of the firing mechanism is seen below. Wire the electronics like so. More plans to
come later. Place the momentary switch in its obvious location, you will need extra wire to do so.
I just duct taped mine in place (oh yes).
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