Need help with a rapid fire / no recoil script

#NoEnv
SendMode Input

_auto := true

~LButton::autofire()
Numlock::_auto := ! _auto
F1::ExitApp

autofire()
{
global _auto
if _auto
{
Loop
{
if GetKeyState("LButton", "P")
{
SendInput {LButton DownTemp}
Sleep 25
mouseXY(0, 1)
SendInput {LButton Up}
Sleep 25
}
else
break
} ;; loop
} ;; if
} ;; autofire()

mouseXY(x,y)
{
DllCall("mouse_event",uint,1,int,x,int,y,uint,0,in t,0)
}