Basically have my main cannon done. Have a 110ci chamber, QEV5 (3/4), and an air blower as the pilot. Running at about 90psi.

If I fill from the pilot side via a high pressure on/off valve on a 3 way T, I could get more shots per fill correct?

I'm running a 20" breech loading barrel. So far, I ...

And here I thought that true 3/4 were as big as they came... /:

What would be an example of a retail version. Though I think I will try to build a DYI version.

What was the approximate cost in materials? Seems like quite a bit.

That is nearly exactly what I had in mind now.

I'll be using a fire extinguisher, so I may end up dropping it into a homemade rifle stock.

I will most likely end up filling from the chamber side and modding the QEV to close faster. Unless there is a better way to do it? I need to maintain auto ...

OK. Well. With the help of a few people I think I understand the air, barrel, projectile, chamber, valve relations.

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I'm going to use a QE5 elbowed into a sch40 2''X40" with a large 150CI chamber. I'll start @ 80psi. This will be my mortar for shooting at a 45* in a fixed position.

I ...

I thought about making clay shots, but just not firing them. They are thin and barely strong enough to survive being shot. Tests tests.

On a side note. I'm talking about shooting stuff at more more than 200fps

Has anyone here ever tested balloons filled with material? I heard they shoot fairly ...

Well. After alot of reading and some help from a few guys here and airsoft and pb sites...... I think I finally understand what I need to do.

I'll be back with the culmination of what I've learned in a bit in the form of a launcher.

Thanks for putting up with the dumb questions haha

Irritating. Well. It shot ok, but leaky all over. These china fittings are garbage.

I think....... I may ditch the 12g all together (getting too expensive). I think I will make one nearly exactly like the one that lockednloaded, but I'm using Co2 with my QE4 valve........ um.....

I have like 10 ...

I had thought of using these in a 2" system to shoot at tanks in our games, but I would think they are too dangerous to use that way. Still trying to find something to use......

Anywho, Can't wait to see some vids of the "cloud" it makes. 8)

Ended up going with 2 LAW inline co2 12grams with a shutoff at the co2 (2000psi carbon steel ball valves) and a 3/4 ball valve to actuate. More simple. Lighter.

Im going to drill and tap the expansion chamber for a 1/4"NPT gauge. I want to have the chamber not go over 100psi even if all the co2 is ...

Gotcha. Yea. Mixed that up real good. haha

I'll see about using what you suggested there. Its basically a diaphragm valve right?

I originally got the QEV to do inline, I was mistaken. I got that QEV4 for like $20 or something, so not a huge loss. LOL

This stuff is pretty new to me, but machining ...

Is this the proper way to run it? If it is, I'll need to do something else. It REALLY needs to be inline. Unless I could hide some 90's in the grip or something.

Yea. I did note that in my post. I just tossed it down for a quick picture.

And I thought the EXH side was the side that needs to hook to the barrel?

Ok. Got my parts in. Now just to figure out what the final length will be, get fitting, etc. I realize I have the QEV backwards in the photo, I'll have the exhaust side facing the proper direction when I go get fittings.

Couple of questions:

Can I simply drill and tap the 2" expansion chamber and ...