Yes but why bother. Air is 80% nitrogen and must be cheaper than an industrial gas.
I didn't notice anything different. After all it's almost the same as HPA. The pressure is what counts.
Now you are splitting hairs I think. Yes its consistent in composition, but it doesnt matter anything, you have so many variables in an airgun anyways. Air or nitrogen doesnt really matter much if all. Put helium in the mix and things start to get different. Marko