Its halfway there...
This has a single entry for field limitations. It should have two variables for offerings here. The first being fps and the second being energy restrictions on the BB.
Its also missing some GUI. You can scroll the BB size, but after you enter your fps you have to randomly tap on the screen to get it to calculate usually resulting in accidentally jumping back in the BB size interface.
I will recommend this to everyone in my airsoft forums when its interface is cleaned up.
Dan-71 about
Airsoft FPS, v2.0