Keydown Script Pulls out Weapon?

here is a simple code in how to detect the players mouse, first you need to get the mouse using the :GetMouse() function.

Player = script.Parent.Parent --Finding You / Player
mouse = Player:GetMouse() -- Getting the players mouse

then we will need to create a funtion to dectect the key press/lowering in this case

function onKeyDown(key)
   key = key:lower()
end
mouse.KeyDown:connect (onKeyDown)

finally we define the key we want to lower into the function

   if key == "q" then --"q" Is the Key that will be pressed for this action to work

So are final code would be:

Player = script.Parent.Parent --Finding You / Player
mouse = Player:GetMouse()

function onKeyDown(key)
   key = key:lower()
   if key == "q" then --"q" Is the Key that will be pressed for this action to work
   end
end
mouse.KeyDown:connect (onKeyDown)

This is just a simple code to set you in the right direction, not the full code