Here is my full auto qev pop off bb gun, it's shooting around 450 fps with 0.30g bbs and about 300 fps with steel 0.90g bbs. It is powered with a paintball bottle with a modfied preset to around 200 psi

Thanks for your help I actually made it cycle well by increasing the pressure of the air coming out of the preset. I now need to figure out how to prevent bbs from rolling out of the barrel, I m using an AEG magazine so there is spring pressure, the gun uses a blow forward valve to cycle the bbs. 20...

How do you post pictures, it will be simplier to show my setup. My pop off valve is actually similar to yours expect it's shorter. The problem can also be the spring in the Qev, your spring look softer than mine. You said before you have replaced the piston with a delrin disk, does this means full a...

Yea I ve made a 1mm hole in the piston and put a spring to reset it. After tweaking the air flow coming in the Qev and my chamber volume i manage go get a high rate of fire full auto but it is way too fast. In your video you are able to get a pretty slow rof, so I'm guessing the problem is the pop o...

I'm making a qev full auto with a blowgun connected to the chmaberside and a compressor pop off valve. My air supply is a 0.2 L paintball tank with a modified preset to ~10 bars. I can't make it cycle full auto i've tried tweaking the pop off valve which can be unscrewed to apply more tension on the...

If you want to make an easy and solid hammer valve, don't do the one in the face off video, use a threaded rod, an acorn nut and a steel washer, screw everything together with an o-ring or teflon tape and you will hace an airtight valve. Now for the gun, making an hammer valve or qev gun is up to yo...

I was thinking about that, I will get an other pressure gauge so I can tune the preset at the pressure I want.

Thanks yall ,to lncrease power I can either increase the volume between the preset and the valve or increase the pressure (for instance 9mm pcp rifle that shoots 200joules uses ~20ml at ~120 bars, mine is ~5ml at 60 bars), but both increase will lead to lower shot count and higher firing pressure. I...

The gun kinda looks like a gun from fallout, it works pretty good and shoots 6mm steel bbs at 700 fps!

If you keep pulling the air pistol trigger does the blow forward valve in the syringe stays open? If so I think by restricting the blowgun airflow you could make it fire fully automatic. As the blowvalve in the syringe releases air in the barrel, air is still coming from the blowgun but with a relat...

I dont understand how the main valve works (i believe it is the white thing with the spring), it must be something like a 2 way QEV with the burst disk acting like a pilot valve, but how does the valve open after the burst disk is pierced?

I've checked, he use them with 4500 psi, using them with 2000 psi should be safe.

Is it safe to put like 1500/2000psi inside a standart 3/4 steel galvanized pipe you find in hardware store, if this works it would be more convenient than buying paintball tank bottle. The only downside is to find some 3/4 to 1/8 adaptor to screw the fill valve in.