Easy Airsoft FPS Calculator APK for Android Download
AEG Gear Ratio Calculator (Premium):Amazon.com:Appstore for Android
Effective and Maximum Range for 6mm BB's
Airsoft calculator APK for Android Download
Ballahack Airsoft - Know the limits and capabilities of your gun! Your FPS may be low, but with a high weight round, it can still carry a heck of a lot of
Not sure if this will be useful for anyone, but I made a pretty cool joule chart. : r/airsoft