50 bar reached with a floating o ring piston and a lot of pumping..yeah

Yes sure, i tried to reduce the dead volume both before and after the check valve. I've found out that probably the o ring of the piston is of the wrong diameter: it should be slightly bigger than the cylinder and not strech when put in its seat. That's the whole thing i reckon.. Please tell me if i...

it's hard to make a piston of that size and i have to use the pump, nothing else

Hi everybody. :D My second project is pretty much finished, it's a pcp with hammer valve. since I'm using a co2 tank i plan to reach 70-80 bar (around 1000 psi) and to do that i built a stirrup pump. i'm having some troubles with the pump though: i reached 38 bar pretty easily with a small chamber, ...

thank you very much

does anybody know the length of the barrel brl102 .22 of the crosman 2200 that jack suggested?

Thanks gippeto!
My idea of cheap.. It would be good if I could spend 20-30 euros for a barrel

Hi everyone, I'm working on a new project of a multishot pcp with hammer valve. I'm thinking of buying a .22 (also .25 would be good) barrel online, but didn't understand if every barrel has a transfer hole like the crosman ones for co2.. It looks like that in many pcp guns the air passes through a ...

Amazing gun, Gipetto!
Where did you find that air cylinder?

Dear jpalf1, I use a rubber disk with a tiny hole to slow the flow from the chamber, so that I don't use all the air. It takes about six or seven seconds to refill the qev.

Jack said the weakest part of my gun is the blowgun. Does anybody know of a stronger sobstitute of my blowgun?

Ok thanks. I'm happy with this gun- I hit a can at 60m!- but I'm thinking of modifing it. What do you think I can change to get a more powerful and more accurate gun. I'd like to say that I've reached 700km/h with 1g pellets.. But that's not enough and I need more accuracy too!

Yes, there are no air losses. And what about the scope mount?
Should I use a rail maybe?

Ok. my gun is finished and it works fine. have you got some better ideas for the scope mount? it's not very stable.. I'm also looking for a better scope, maybe a 6x32 or something like that. my budget is about 40 euros. Any suggestion? thank you in advance. ps what's the highest pressure i can reach...

There's a big waste of air, i have to find something different or a small blow gun. And i have to use it reverse or it will leak

ok. I've finished my gun and it works very well. what can I use for the trigger instead of a blow gun?