My only advice is, bite the bullet, and buy a decent all in one compressor. Yes, Shoeboxes and Altaros boosters are nice to have, until you REALLY start using the air. I have a small tank I use when I'm out for just a couple of hours, but I bring out the 88 cf one when I'm out for the day. Last full day trip took the big tank down from 4,500 psi, to 3,400 psi. That's about 40ish refills for the Marauder, but only about 30 refills for the 9mm (≈50 rounds, tops!).
