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Air tank

I have an Omega 100cf and an Omega 75cf and the size difference is not very much.

Why two cylinders? After multiple fills, when the pressure in the first cylinder drops to below the pressure level that you want to fill your gun to, you can still use the first tank (with lower pressure) to “bulk re-fill” the rifle’s cylinder, then use the second cylinder (which has higher pressure available) just to top off the rifle to maximum pressure. In this way, you can get a lot more use of the air out of each tank. When their pressures drop down - but they still have a lot of air remaining in them!