I got one of these from RAP4 and was wondering if its ok to charge it through a soda-stream bottle that I have from my bulk fill Drulov. I think its possible to adapt the filling but have no idea what pressure the co2 is in these soda bottles, also how practical it is to have them refilled as the one i have is an old style as thats what fits the fill cap i have. I was told up to 850 psi is normal for the 12g cartridge. The alternative is to buy a small paint ball tank and use that, I'm just trying to save cost but any ideas welcome.