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
Download Airsoft FPS Calculator app for iPhone and iPad
Airsoft FPS Calculator - Airsoftic
ASG Calc - The AirSoft calculator
What Would My Gun Shoot At?? A comprehensive fps conversion chart. - HappyFox