i am interested in getting the "NEW PAINTBALL CO2 & COMPRESS AIR REGULATOR 0-150PSI" on ebay, will this give me a steady bubble rate if used with watts a41 needle valve?
I've got this on order, but it will be a while before I get it (ships from China). I won't be using it directly (I'll be placing it on top of the AG1 Gen2 regulator), so I can't say for sure.
However, if you have a system with a regulator that holds a constant pressure, it should not matter which needle valve you are using. As long as the needle valve does not move (which, I'm assuming, most don't), you should get a steady flow from a good regulator. Of course, a better needle valve will be easier to adjust, initially.
Another option is to go to a paintball shop and describe to them what you are trying to do (CO2 regulator on a paintball cylinder). They might be able to set you up with something.
I can say that the AG1 Gen2 works well and holds a steady pressure and steady bubble rate with the Swagelok SS-OVM2 (about $21 including shipping from Ebay) needle valve that I'm using.
Unfortunately, it is hard to tell with the AG1 Gen2 just what the output pressure is. There are 100, 200, 300, 400, etc. PSI markings, but the 100 psi marking is close to the 0 marking, and the needle, at rest, is somewhere between 0 and 100. I definitely want to keep it under 100 psi, so I'm trying to be just a bit below the 100 psi marking.
With the new regulator coming in (that you mentioned), the markings go from 0 - 300. So, I can crank the AG1 Gen2 up to maybe 400 psi, and adjust the new regulator to 50 psi.
Once I've got this set up, I'll try a pressure increase on the primary regulator (AG1 Gen2) and see if the output pressure holds steady or increases (simulated EOTD).