Newer member here. I recently got a NOTOS and a SCUBA tank for my air source. I am just curious about the approximate number of fills. I haven't counted how many times I've filled the gun but I was getting 3000 psi and the last couple times it is only going to about 2800 depending on how accurate the gauges actually are. I am still pleased with this setup for my use but wander how many times I can fill the gun before I need to get the SCUBA tank topped back off. Good thing is I have a source to get the tank filled at no cost....