No, I plan on going to the local dive shop which can fill to 4,500 psi. The Steyr air pistol uses a very small amount of air and by my calculations, I will get 85 fills per from a 75 cu ft tank with a reduction in tank pressure from 4,500 psi to 2900 psi. With this low air consumption, I do not believe it makes sense for me to invest in a compressor.
Nope, however with that little reservoir possibly a portable compressor will do. Figuring what a new tank will cost. Remember that an used tank will have to be certified and tested!