I use the kISS method. I have had a variety of airbrushes in my modeling lifetime including gravity feed duel action, I always return to the simplest to clean and maintain. To me the 2 that are best are the Paasche H
single action and the Binks Wren single action A Tip. I have found that the control for MOST camo schemes is acheivable once you get your mixture and pressure right. This comes with practice. Some of the schemes that are more difficult but not impossible are Italian WW1 part 2 smoke ring camo and German Wave Mirror patterns. Quite honestly I haven't run into a WW1 pattern I can't handle with a single action airbrush! Both of the guns I mentioned are relatively inexpensive. IHTH, and I am sure that others will disagree
RAGIII