why isn't my raycasting detecting anything?

So this script basically gets the position from the camera to the point in world space and then makes a new ray from your gun barrel to where ever the click location is at. I have explained a bit more with comments.

local tool = script.Parent
local UserInputService = game:GetService("UserInputService")
local player = game.Players.LocalPlayer
local Camera = workspace.CurrentCamera
local equipped = false
local character = player.Character:GetChildren()
local toolOrigin = character:FindFirstChildOfClass("Tool").tool.barrel.Position
local RE = game.ReplicatedStorage:WaitForChild("RemoteEvent1")

tool.Equipped:Connect(function()
    equipped = true
end)

tool.Unequipped:Connect(function()
    equipped = false
end)

function getMouseHit(x,y)
    local ray = Camera:ScreenPointToRay(x, y, 0)
    local ray1 = Ray.new(ray.Origin,ray.Direction * 1000)
    local part, hitPos, norm = workspace:FindPartOnRayWithIgnoreList(ray1,character)
    return CFrame.new(hitPos,ray1.Origin)*CFrame.Angles(0,math.rad(180),0)
end

UserInputService.InputBegan:Connect(function(input, gameProcessed)
    if equipped and not gameProcessed and input.UserInputType == Enum.UserInputType.MouseButton1 then
        local worldCF = getMouseHit(input.Position.X,input.Position.Y)
        RE:FireServer(toolOrigin,worldCF,character)
    end
end)

Server script:

local RE = Instance.new("RemoteEvent")
RE.Name = "RemoteEvent1"
RE.Parent = game.ReplicatedStorage

RE.OnServerEvent:Connect(function(player,toolOrigin,worldCF,character)
    local ray = Ray.new(toolOrigin,(worldCF.Position-toolOrigin).Unit)
    local ray1 = Ray.new(ray.Origin,ray.Direction * 1000)
    local part, hitPos, norm = workspace:FindPartOnRayWithIgnoreList(ray1,character)
    if part then
        print(part," yay!") 
    else
        print(part," awww")
    end
end)

Make sure that the second value of Ray.new is a unit vector. A unit vector is a vector value with a magnitude of 1, used to indicate a direction. To make a unit out of two positions, you use (PositionB - PositionA).Unit and multiply that value by a scalar (a number). If that's too complicated, you can also do CFrame.new(PositionA, PositionB).LookVector * Scalar as well.