:blush:This is more of a "just in case" but I'm sure I already know the answer. I picked up my MRC-5 CA reactor today and need to get the CO2 tank filled. Assuming CO2 is just CO2 but, is there anywhere I should NOT take it to get it filled. There's a paintball place not far from here where we fill up tanks for the guns and I'm assuming that would be ok. I'd rather ask than to find out later I should have asked.