[T-Raw]

first u need create a save spot for the weaponskills,

then get, here is an example

OnPlayerShootPlayer
{
if(GetPlayerWeapon(Shooter) == 21)
{
SetPlayerWeaponSkill(Shooter, WEAPONSKILL_PISTOL, PlayerInfo[playerid][pWSkill] =+ 15//u need ur own player save stuff here);
}
return 1;
}