How to properly get Mouse.Hit.p for camera manipulation w/ tools?

This code makes a gun move with the player's camera.

Basically my problem is that in low-roofed buildings the camera doesn't move properly because the Y value of mouse.hit.p is not great enough to render a difference. The same goes for when you look down towards the ground. It barely budges!

Here's my code: (mouse is already marked as the player's mouse in the equip function RAni and LAni are the arm's welds respectively.)

RAni = p.Character.Torso["RightAni"]
CF = RAni.C1
LAni = p.Character.Torso["LeftAni"]
CF2 = LAni.C1

mouse.Move:connect(function()
    if script.Parent.Firing.Value then wait() return end
    if script.Parent.Reloading.Value then wait() return end

if p.Character:FindFirstChild(script.Parent.Name)~= nil then
local dir = mouse.Hit.p.Unit
local pitch = math.asin(dir.Y)
RAni.C1 = CF * CFrame.Angles(-pitch,0,0)
LAni.C1 = CF2 * CFrame.Angles(-pitch,0,0)
end
end)

I'd appreciate help, or a better algorithm if you have one. Thanks!