Listen to these other guys, they know what they are talking about.
I read A LOT on here and decided for safety sake to go with the ninja tank and a palmers low pressure regulator. Between the Ninja adjusted down to 450 PSI and the palmers bringing it down further to 100 PSI. I am not worried if one of the two where to fail because the other will compensate for it and the blow off valve would only have to deal with 450 PSI which shouldnt blow up my air tank under my arm.
Seriously...High pressure gases are not to be trifled with. Your desire for "inexpensive" isn't unusual, but ask yourself if the risk of injury is worth the few dollars saved by taking a short cut. Using high pressure SAFELY is going to cost you some money...that's the simple truth. The regulator on my N2 setup retails around the $800mark...properly rated hoses, fittings and valves bring the price of admission higher....the Palmers reg is a bargain.
As for the valve freezing up...I wouldn't worry too much about that unless your rate of fire was very high.
Roughly similar in size to a 48/3000 tank and easy to find is a 20oz co2 tank.
1g of liquid co2 = 33.9in2 @ 1 Atm (14.7PSI)
20oz =567grams so we have 19221.3 in2@ 1 Atm
1Atm is 14.7psi and we need to convert 300psi to atm...300/14.7psi= 20.4Atm
Divide the volume by 20.4Atm...19221.3/20.4=942.2 in3 @ 300psi
Do an equivalent for the 48/3000....48in3 * 3000psi...144000 and then divide by the outlet pressure (300psi)
144000/300 =480 in3 @ 300psi
Now we're comparing two volumes of gases at the same pressure...
Is 942 in3 not substantially more volume than 480 in3 ?
Aside...Goatz...yer chuck key better not be left in yer chuck...or I'll be givin ya'll hell.
Im now confused because I thought a HPA air tank would give me more launch air than Co2.
As in my 48ci/3000psi air tank would give me more shots at 100psi than a 20oz Co2 tank at 100 psi. Your math shows that to be the opposite.
The reason I thought it was because I got more shots out of my paintball gun with a 48ci/3000psi HPA tank than I did out of my 20oz Co2 setup on the same gun at the same FPS.