How do I make a variable cross over using a RemoteEvent?

I'm making a sell to player gui and I have this as a local script under StarterPlayerScripts

local Player = game.Players.LocalPlayer -- Getting the player   
local Mouse = Player:GetMouse() -- Getting the players mouse


Mouse.Button1Down:Connect(function() -- Detecting when player presses the left mouse button
    if Mouse.Target.Parent:FindFirstChild("Humanoid") and 
        game.Players.LocalPlayer.TeamColor.Name == ("Dirt brown") then -- Checking if the Mouse is over a player
        print(Mouse.Target.Parent.Name) 
		game.ReplicatedStorage.SellPistol:FireServer(Mouse.Target)
		
	


    end
end)

I also have this being connected to in a script under ServerScriptService

local SellPistol = game.ReplicatedStorage.SellPistol

local function onSellPistol(Mouse.Target)
	Mouse.Target.StarterGui.StartScreen.Frame = Visible
end






SellPistol.OnServerEvent:Connect(onSellPistol)

How can I bring the (Mouse.Target) into the script using the FireServer from the RemoteEvent?