Originally Posted by iliveforthis99
HPA is not the same thing as nitrogen. You can use nitrogen in any compressed air (HPA) tank but you won't find many places that fill nitrogen anymore, compressed air as taken over completely there. ICD says it can use CO2 (as long as it's anti-siphoned) but HPA is very much recommended to use.
What do you mean by anti-siphoned? And when arenas' fill your tank is it always anti-shiphoned? Also what kind of tank would I use for HPA?