[Lordzy]

This filterscript can be used as an exploit because you're not checking the hittype under OnPlayerWeaponShot. Also, IMO, the concept used here isn't really good. Calculating the player's skill randomly isn't really the way it has to be worked out, you should check how good the player shoots. To make it quick, I'd calculate the time spent to shoot, number of bullets fired and it's shot accuracy.