Hello everyone. I made a new valve, it will work on CO2. How it looks inside can be seen in the diagram. The turner made the blue part for me on the machine, I soldered it inside the tee.

A few days ago, I managed to make and test a piston valve with a caliber of 40 mm. I managed to make an exit into the barrel with a diameter of 14 mm. I pumped 50 atm into a cannon with a homemade pump.

Hey guy's me again Ive tried a few design's and idea's for my homemade blowback uzi but they didn't work so well. So I decided to use a qev this one to be exact https://encrypted-tbn3.gstatic.com/shopping?q=tbn:ANd9GcTTE4lUtjnpS6IxJ-J2xkwNrblpyn5sxob2zCMU76pP5viKfH12k9dFP-8DaiUv9yUXF9k6qWeN4SI&usqp...

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I did it once. Maybe it will help you.

there is too much extra volume in the gun. Pop of the valve does not have time to lower everything, so that the piston valve would work. Try to fill the whole empty space with cold welding or epoxy glue. For air, make a channel 3-4 mm in diameter, this is enough.

Air goes too fast through the gun to pump the wheels. Due to the large flow of pop-off, the valve cannot close. After the gun and in front of the pop-off valve, put a partition with a very small hole, with a diameter of 1-0.5 mm, not more, this will help.

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I have a video with shooting from this rifle.

My friend made another gun. It is made of a fire extinguisher, the valve is balanced. He made her keak toy for his younger brother.

Try to connect instead of the pump cylinder with Greengas. This can be done even with cold welding and electrical tape.

But what I did. A pistol with a balanced valve as in the picture. I pumped up and 100 atm, but the best bullet speed starts from 70 to 50 atm, from 160m / s to 130 m / s. The number of shots is 30.
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[youtube][/youtube] And what can you say about such a gun?)) The pressure is 120 atm, the barrel is smooth, the accuracy is 20 cm by 20 meters. A balanced valve is used.

Strange, it is impossible to attach a video, only the link.

My friend has long been interested in medium and high pressure pneumatics. Just like me, she does it with the help of plumbing and simple tools. For example, here is one of his guns. This is a coaxial circuit, caliber 20 millimeters, pressure 40 atm. Homemade fully in the style of this site. https:/...

Jack, this scheme will not be more effective? The piston in the bypass is smaller than the volume in the drummer.