Co2 and N2 Mixture are both gasses that go in same size cartridges. N2 Mixture stands for 1100PSI High Pressure Air. Nitrogen and Co2 are both 800Psi high pressure gasses. N2 Mixture are cleaner, and expand much faster than co2, which as you may know can be pretty inconsistent and crappy in cold weather. You can get HPA tanks filled by a high output air compressor(which are powered by gas or electricity), or a full scuba tank. Normal $50 air compressors will not work, they only output at 125psi, and HPA paintball tanks operate at 3000-4500 psi.
