server side projectile raycast system

local Debris = game:GetService("Debris")
local TweenService = game:GetService("TweenService")
local ReplicatedStorage = game:GetService("ReplicatedStorage")

local Module = require(script.FastCastRedux)

local Tool = script.Parent
local RemoteEvent = Tool:WaitForChild("RemoteEvent")
local GunConfig = Tool:WaitForChild("Configuration")

local Bullet = ReplicatedStorage:FindFirstChild("Bullet")
local Audio = Tool.Handle:FindFirstChild("Shoot")

local OnCooldown = false

function FolderStorage()
    local Folder = workspace:FindFirstChild("BulletStorage")
    if not Folder then
        Folder = Instance.new("Folder",workspace)
        Folder.Name = "BulletStorage"
    end

    return Folder
end

function Hit(Cast,Result)
    local Hit = Result.Instance
    if Hit then
        local Humanoid = Hit.Parent:FindFirstChildOfClass("Humanoid") or Hit.Parent.Parent:FindFirstChildOfClass("Humanoid")
        if Humanoid then
            Humanoid:TakeDamage(GunConfig.Damage.Value)
        end
    end
end

function RayUpdate(Cast, Origin, Direction, Length, Velocity, PartObject)
    if PartObject then
        local PartLength = PartObject.Size.Z/2
        local BaseCF = CFrame.new(Origin,Origin+Direction)

        TweenService:Create(PartObject,TweenInfo.new(((Origin-Direction).Magnitude/Velocity.Magnitude)/1.2),{CFrame = BaseCF*CFrame.new(0,0,-(Length-PartLength))}):Play()
    end
end

function RayTerminating(Cast)
    local RayInfo = Cast.RayInfo
    if RayInfo then
        local PartObject = RayInfo.CosmeticBulletObject
        if PartObject then
            TweenService:Create(PartObject,TweenInfo.new(.5),{Transparency = 1}):Play()
            Debris:AddItem(PartObject,.55)
        end
    end
end

RemoteEvent.OnServerEvent:Connect(function(Player,Position)
    if Position ~= nil and Player.Character and not OnCooldown then
        OnCooldown = true
        task.delay(GunConfig.ShootSpeed.Value,function()
            OnCooldown = false
        end)

        local FastCastRedux = Module.new()
        FastCastRedux.VisualizeCasts = false

        local Params = RaycastParams.new()
        Params.FilterType = Enum.RaycastFilterType.Blacklist
        Params.FilterDescendantsInstances = {Player.Character}
        Params.IgnoreWater = true

        local Behavior = Module.newBehavior()

        Behavior.RaycastParams = Params
        Behavior.MaxDistance = 3000
        Behavior.AutoIgnoreContainer = false
        Behavior.CosmeticBulletTemplate = Bullet
        Behavior.CosmeticBulletContainer = FolderStorage()
        Behavior.Acceleration = Vector3.new(0,GunConfig.BulletDrop.Value,0)
        Behavior.HighFidelityBehavior = Module.HighFidelityBehavior.Default

        local Origin = Tool.Handle.ShootPart.WorldPosition
        local Direction = CFrame.new(Origin)*CFrame.new(0,0,-100)
        local OriginToDirection = CFrame.new(Origin,Position).LookVector

        FastCastRedux:Fire(Origin,Direction.Position,OriginToDirection*GunConfig.Velocity.Value,Behavior)

        if Audio then
            local SFX = Audio:Clone()
            SFX.PlayOnRemove = true
            SFX.Parent = Audio.Parent
            SFX:Destroy()
        end

        FastCastRedux.RayHit:Connect(Hit)
        FastCastRedux.LengthChanged:Connect(RayUpdate)
        FastCastRedux.CastTerminating:Connect(RayTerminating)
    end
end)