Air and co2

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No problem. I suggest you read the paintball basics 101 thread loads of great stuff.

Be sure to check if the local infrastructure can fill 4500psi especially if you're on a budget.  If you can only get 3000psi fills, it doesn't make much sense to spend the extra money.

I recently did the same thing that you are wanting to do.  I can't really say for sure that air will be "more accurate" but you will gain some advantages by air being MUCH more consistant than CO2.  I personally didn't see a gain in accuracy, but as I was really throwing paint my my velocity didn't drop off and that really helped me.  I was able to buy a used SCUBA tank from my local paintball shop and then a tank to screw on my gun and I was set.  (I had to buy the SCUBA tank because I normally play on fields were they don't have air fills so I fill from it between each game. You wouldn't need this tank if you play at a field where they can fill the air.)

Before investing iin an HPA tank, try renting one the next time you go and play. Even cheap tanks arent cheap. Make sur you want to make the leap before you invest.

thejudge wrote: also if you want to save weight go for a carbon wrapped tank.  I know a few companies make one in a 3000 psi but most are the 4500.  for the record you can fill a 4500 to 3000.

True, but 4500psi carbon wrapped tanks are typically a whole lot more money than an aluminum 3000psi. If i am not mistaken.

How bout this... Weigh all your options carefully and keep an eye on your wallet.

THANKS GUYS FOR ALL YOUR ADVICE