The ammo doesn't go through the forks.... a lot of PFS only have a fork gap the tie the band's on with... Some don't even have the gap...
The ammo goes over the forks due to the FLIP.... Or twisting and tweaking the pouch....
As with other catapults I'm sure it has been proven that all styles of catapults... The ammo actually passes THROUGH THE FORKS... even on OTT attachments....
Unless you flip.