Some padding is definitely in order. Still trying to figure out what material to use. Thanks for compliment and help jack.

Planning to shoot this weekend, will post some damage pics hopefully soon.

It took me awhile to complete this but it is finally done. Thanks again to all of the members on here who helped me with this. Air Chamber-3" x 24" Aluminum Schedule 40 Barrel #1-3" x 40" Aluminum Schedule 40 Barrel #2-2" x 48" Aluminum Schedule 40 Valve-Goyen 2" Dust Collector Diaphgragm Valve Trig...

Would a 1.5" dust collector diaphragm valve be to small for a 3" barrel? I am assuming will be fine wanted to see if anyone has any first hand experience with this set up. Thanks.

I see, I am gonna wait and see how bad the recoil is then decide on what to do. I was originally trying to weld a track system to the bottom of the chamber and have a single gas strut.

Not sure if that would work since it would not distibute force evenly.

I am trying to figure out how to mount it to my chamber. I am going to have a bar come straight down from chamber to act as the stock.

I was doing some research last night on how to do the recoil absorpotion system. I some some linear rail systems that were over $150. I'm sure there is a more economical way to do this. I am trying to make this gun look as nice as possible so any ideas would be appreciated. I think I am going to foc...

I would model it but I don't know what the pressure on 2" gun will be that will be max that I can handle.

This is probably a dumb ? bur I want to make sure before buying the valve.

If I have to fire the 2" valve at lower pressure do to recoil than say the 1.5" valve. The heavier projectile even though firing at a lower pressure will still go a further distance than say the 1.5" at a high psi correct.

All good man, I just don't want to buy this really powerful valve and I can't use it to full potential cause it's too powerful.

Haha, well my gun will weigh around 30 pounds I am guessing. Already have some fittings and about to order rest once I decide on size. Will be aluminum so won't be an extremely heavy fun. Well, won't I be able to compensate for the lack of efficiency b using a higher pressure? The 2" valve is double...

I am still undecided on which to get, the last post jhalek is what I am worried about. I want a gun I can fire from shoulder without getting hurt.

I talked to one of their engineers today and he said it opened between 50-70 ms. I hope it opens in 10 ms.

Anyone know a way to make a muzzle brake like device without make the gun any louder? Is there a way to have a suppressor help with recoil?

.07 seconds? It is a dust collector valve which is supposed to be one of the fastest valves. Double diaphragm port valve. Isn't that pretty fast?

I could be doing the GGDT calculation incorrectly then, not positive about that M.E. #. I am using 150 psi, projectile will weight 6 oz. Valve is 2" with 88 C.V. Barrel is 3"x48" and Chamber is 3" x 48". Open time is 70ms. I figured with a projectile that heavy is would kick pretty bad.