Where did you find that slide valve? I can't find them in stores.
I say drill ,ore small holes; opening time is more important.

Al-xg, were you using it with co2?

They also eject a lot of high pressure Co2 from the bolt ( I am trying to best the tipmann 98 ) The design I am using does waste some pilot air, but it is used to power to mag, like the a5. Commercial markers are limited to low-flow designs, with high pressure co2 to counter. Higher pressure = more ...

I am trying to determine what size and pressure to run the chamber of my in-the-works paintball gun at in order to achieve a higher efficiency than a regular paintball marker. To do this, I need to know how much co2 is used in a regular marker per shot. Co2 runs at about 850 psi at room temp, and a ...

Just an observation...sched 80 3/4" has a fairly mondo pressure rating of 690 psi. Were you looking for the pressure capacity of sched 120 or going use the unique ID in some way? Both. :twisted: But mainly for the ID, which is .69". Good paintballs have a diameter of .689". The closer the fit, the ...

Well, the gun is going to be as "bullpup" as I can make it, meaning the barrel starts at the stock. I was thinking of making it about 3-4 feet long, but only 2' would protrude from the gun, unsupported. Also, I was planning on partially sleeving the barrel (OD of 1.05") in 1" sch 40 pvc (ID 1.033") ...

Really? Wouldn't a thicker pipe be stiffer? I am sure thqt the extrq thickness would support the extrq weight.

Yesterday I called pipeline plastics , and asked them about the sch 120 pvc. They said they had none in stock but they could order some! In 2-3 weeks I will be down with some sch 120 3/4 pvc, .69" caliber, PERFECT for paintball. :D It was kinda expensive, at $ 1.49 per foot. If anyone wants sch 120 ...

I have 3 metalworking lathes at work, but I don't know how to use 'em! Is there some kind of guide online?

Yes, it is for the barrel of a paintball gun. I know CPVC works ok, and 1/2 sdr 21 works better, but 3/4 sch120 has the exact ID I need. I am going for accuracy and efficiency, and an exact ID will do that. Plus, the OD makes is able to sleeve into 1" sch 40 pvc, a must for a bolt. The pressure rati...

Thanks. On google maps (search "fastenal 19380" -it's letter A) it appears to be 3/4 the size of home depot. I hope its a store and not a warehouse.

Where is the best place that I could get 3/4" sch 120 PVC, but NOT ONLINE? I don't have credit cards, ect., only hard cash. I do have a place called "pipeline plastics" nearby; it has a huge stockpile of PVC, but on their website they only list sch 40 and 80. I also have the local Home Depot, Lowes,...

Holy Fricken AWESOME! I just did a search too, and it turns out that fastenal is only 2 miles away!

I won't kiss you, but this just made my project a lot more do-able (covertly) 8).

Is the place similar to a home depot, where a teen can walk around and shop, and pay in cash?

I'm all for the competition, but make sure that there is no entry fee.

I have the time, money, and plans to build my paintball semi, but I still don't have permission. My new job gives me access to lathes, drill presses, Everything! Perhaps a covert gun is possible.

It seems to me that it is the same as JSR's failed auto blow-forward bolt, except it is not inline. You may have problems with it cycling.

However, that just gave me an idea for a blow forward bolt that uses chamber pressure to open, but closes when the chamber is fired.

Ragnarok wrote:y, this thing is nearly up there with a round from a .50 BMG rifle - which is pretty amazing.

D@mb... that is exactly what I would have guessed, but I did not want to say it for fear of over-guessing. This is AWESOME!