Ok, so because I am trying to save money (half to actually save money and half for the challenge) I decided on a new build for my small batch 2 liter carbonator, I am going to adapt the one I already have which I posted in the original post and basically just replace the regular chuck with a locking chuck that also has a build in psi gauge (if i can find one) and I will add a valve in the middle of the line to control the CO2 flow. This way I can still use the tire stem system which is cheap and easy, not waste too much CO2, and be able to control my charging more accurately and know the pressure inside the 2 liter. I will update with pictures if I can get this together successfully. The main reason I want the valve and the CO2 gauge is because I know the paintball regulator doesnt get the psi any lower than about 100 psi, which is way to high and could burst a 2 liter bottle. Hell, actually I could just replace my regular chuck at the end with something like this and get two in one.