I'm having a bit of a problem with these guns, how do I fix them?

I'm quite inexperienced at coding, but I wanted to try modifying some existing gun scripts. I tried to keybind the guns to Q, another method I tried resulted in the guns dropping out of the aim stance any time I pressed any other button.

The original script was like this:

mouse.Button2Down:connect(function()
		if not meleeing and not reloading then
			aim:Play()
			aiming = true
			tool.GripForward = Vector3.new(-0.1, 0, -0.9)
			tool.GripRight = Vector3.new(0.9, 0, -0.1)
			mouse.Button2Up:connect(function()
				aiming = false
				aim:Stop()
				tool.GripForward = Vector3.new(0, 0, -1)
				tool.GripRight = Vector3.new(1, 0, 0)
			end)
		end
	end)

The first thing I tried was this:

`mouse.KeyDown:connect(function(key)
		if key == "q" and not meleeing and not reloading then
			aim:Play()
			aiming = true
			tool.GripForward = Vector3.new(-0.1, 0, -0.9)
			tool.GripRight = Vector3.new(0.9, 0, -0.1)
				mouse.KeyDown:connect(function()
				aiming = false
				aim:Stop()
				tool.GripForward = Vector3.new(0, 0, -1)
				tool.GripRight = Vector3.new(1, 0, 0)
			end)
		end
	end)

and here's what I did most recently :

`mouse.KeyDown:connect(function(key)
		if key == "q" and not meleeing and not reloading then
			aim:Play()
			aiming = true
			tool.GripForward = Vector3.new(-0.1, 0, -0.9)
			tool.GripRight = Vector3.new(0.9, 0, -0.1)
				mouse.KeyDown:connect(function()
				if key == "q" and aiming then 
				aiming = false
				aim:Stop()
				tool.GripForward = Vector3.new(0, 0, -1)
				tool.GripRight = Vector3.new(1, 0, 0)
			end)
		end
	end)
`

But I got an error that said: Expected identifier, got ')' when I tried the most recent method how do I correct this error?

This is the important error:

mouse.KeyDown:connect(function()
                if key == "q" and aiming then

you did not put a "key" parameter inside the function() parentheses. So, it uses the key variable that you already defined long before, which will always be "q".