Originally Posted by PistolRogue
It most likely has more to do with the size and shape of the porting than anything else, but I'm not exactly an expert in fluid dynamics.
I agree. The weight will play a role, but there are several lighter bolts that do not change the FPS of the ball. The most efficient airpath will have the highest FPS compared to the others (in a nutshell) and it looks like the L6 is the winner.