Will this gun script work?

Trying to learn to script guns, so I decided I would try and make one using part of the wikis script and some of my coding.

local tool = script.Parent
local user
user = tool.Parent
tool.Equiped:connect(function(mouse)
      missile = Instance.new("Part")
missile.Name = "Bullet"
missile.Shape = "Block"
missile.Anchored = false
missile.CanCollide = true
missile.CFrame = handle.CFrame
missile.Size = Vector3.new(1, 1.2, 7)
missile.BrickColor = BrickColor.new("Really black")  --when the left mouse button is clicked
   mouse.Button1Down:connect(function() 
       --make and do a hit test along the ray
       local ray = Ray.new(tool.Handle.CFrame.p, (mouse.Hit.p - tool.Handle.CFrame.p).unit*300)
       local hit, position = game.Workspace:FindPartOnRay(ray, user)

       --do damage to any humanoids hit
       local humanoid = hit and hit.Parent and hit.Parent:FindFirstChild("Humanoid")
       if humanoid then
           humanoid:TakeDamage(10)
       end
end)
end)