is it open source?
Obviously, this resource follows the forum rules Releases Rules and FAQ.
is there an event or something to change the xp/level?
Yeah as i said the code is simple and intuitive, so you can change it easily. There is an event for upgrading the skill level.
if someone is killing npcs all the time, they can incrise the recoil to max?
As the update i stated it works only when killing players and there is a cap of max skill so no worries.
when no weapons outside, how ms?
~ 0.02 - 0.03 idle