ok thanks for the replies, I could build a hammer valve but it would be difficult because it would be my first time building one. Also how would i make a semi auto without a bfb it dosent seem like it would feed correctly although i could still make this a mag fed bolt action. I was considering full...

ok so i have decided on my next project and i am building a pcp air rifle! My goals i have are the following accurate 700fps but can be adjusted for higher velocity operates on a co2 tank or hpa(regulated) efficient So far im pretty much dead set on .177 as my caliber but maybe .22 but because of th...

thanks, the dollar stor by my house only has the half circle marbles

http://www.ebay.com.au/itm/Car-Wash-Cleaner-Brass-Adapter-High-Pressure-Water-Gun-/200790729725?pt=AU_Car_Parts_Accessories&hash=item2ec00f63fd#ht_2573wt_1139 ^seems cheap heres a really freaking good deal http://www.ebay.com/itm/MSA-30min-Carbon-Cylinder-4500psi-/120933178422?pt=BI_Security_Fire_Pr...

these valves gotta be able to hold more then 125psi? so are thes like a sprinkler valve or qev?

Can someone please give me a link to really cheap marbles and or ball bearings? I need them for 1/2 in barrels so if someone can give me a link to 8-10 mm ammo it would be highly appreciated thanks!

THAT IS FREAKING AWSOME!!!

well i am going to build another gun very very soon im not sure about the output pressure on the helium tanks though My goal for my next project is something powerful and has alot of recoil i dont think i should move onto hybrids yet though. i dont want to start a new thread or talk about it in this...

true , but would i be able to mix helium and air for better performance? i can get propane tank sized cylinders at party city for 30$

DYI- I made the post because i thought the information could possibly help someone who wants to know what velocity there projectile needs to travel at to have a certain muzzle energy.The info might help people in future projects as well. jsr and ramses- wouldent i need some sort of special equipment...

good to know thanks alot!

why are supersonic velocities harder to achieve with air? i have always wondered but never bothered to ask anyone

also couldent someone use co2 to acheive a higher velocity? or would a gas lighter than oxygen such as helium make the projectile go faster?

Yesterday i did a little bit of research on air rifle pellets and what velocities are required for a certain muzzle energy. I decided to make my target muzzle energies 45 ft lbs , 55 ft lbs , and 63.5 ft lbs because i wanted to do a little test for a few reasons 1. the fpe gives me extra power for d...

ok thanks alot!

Sorry about this double post but i got my qev to seal but i want to fill it through the air chamber, what do i do so i can fill it that way? i saw threads saying make a small hole in the center but then it would leak out of the barrel wouldn't it?

jsr i dont see how i can use that slide valve, i dont see any threads? also i want to shoot .25 cal pellets or .22 but it seems like it would be very difficult to make a magazine to feed them. what do you guys think? The bad thing about me making a hammer valve is i am not sure wha to use to make a ...