local Players = game:GetService("Players")
local player = Players.LocalPlayer
local mouse = player:GetMouse()
local playerGui = player:WaitForChild("PlayerGui")
local toolFolder, remote

for i, v in player:GetDescendants() do
	if v.Name == "SyncAPI" then
		toolFolder = v.Parent
	end
end
for i, v in game.ReplicatedStorage:GetDescendants() do
	if v.Name == "SyncAPI" then
		toolFolder = v.Parent
	end
end

if not toolFolder then
	warn("F3X SyncAPI not found!")
	return
end

remote = toolFolder.SyncAPI.ServerEndpoint
function _(args)
	remote:InvokeServer(unpack(args))
end

function CreatePart(cf, parent)
	local args = {
		[1] = "CreatePart",
		[2] = "Normal",
		[3] = cf,
		[4] = parent
	}
	return remote:InvokeServer(unpack(args))
end

function DestroyPart(part)
	local args = {
		[1] = "Remove",
		[2] = {
			[1] = part
		}
	}
	_(args)
end

function Resize(part, size, cf)
	local args = {
		[1] = "SyncResize",
		[2] = {
			[1] = {
				["Part"] = part,
				["CFrame"] = cf,
				["Size"] = size
			}
		}
	}
	_(args)
end

function MovePart(part, cf)
	local args = {
		[1] = "SyncMove",
		[2] = {
			[1] = {
				["Part"] = part,
				["CFrame"] = cf
			}
		}
	}
	_(args)
end

local maxAmmo = 10
local currentAmmo = maxAmmo
local isReloading = false

local screenGui = Instance.new("ScreenGui")
screenGui.Name = "F3X_GunGUI"
screenGui.ResetOnSpawn = false
screenGui.Enabled = false
screenGui.Parent = playerGui

local ammoLabel = Instance.new("TextLabel")
ammoLabel.Size = UDim2.new(0, 160, 0, 40)
ammoLabel.Position = UDim2.new(1, -180, 1, -100)
ammoLabel.BackgroundColor3 = Color3.fromRGB(30, 30, 30)
ammoLabel.TextColor3 = Color3.fromRGB(255, 255, 255)
ammoLabel.Font = Enum.Font.SourceSansBold
ammoLabel.TextSize = 20
ammoLabel.Text = "Ammo: 10 / 10"
ammoLabel.Parent = screenGui

local reloadButton = Instance.new("TextButton")
reloadButton.Size = UDim2.new(0, 160, 0, 40)
reloadButton.Position = UDim2.new(1, -180, 1, -50)
reloadButton.BackgroundColor3 = Color3.fromRGB(60, 60, 60)
reloadButton.TextColor3 = Color3.fromRGB(255, 255, 255)
reloadButton.Font = Enum.Font.SourceSansBold
reloadButton.TextSize = 18
reloadButton.Text = "Reload"
reloadButton.Parent = screenGui

local function updateAmmoUI()
	if isReloading then
		ammoLabel.Text = "Reloading..."
	else
		ammoLabel.Text = "Ammo: " .. currentAmmo .. " / " .. maxAmmo
	end
end

reloadButton.MouseButton1Click:Connect(function()
	if isReloading or currentAmmo == maxAmmo then return end
	isReloading = true
	updateAmmoUI()
	
	task.wait(1.5)
	currentAmmo = maxAmmo
	isReloading = false
	updateAmmoUI()
end)

local tool = Instance.new("Tool")
tool.Name = "F3X Advanced Combat Gun"
tool.RequiresHandle = true
tool.Parent = player:WaitForChild("Backpack")

local handle = Instance.new("Part")
handle.Name = "Handle"
handle.Size = Vector3.new(0.5, 1.1, 0.7)
handle.BrickColor = BrickColor.new("Dark stone grey")
handle.Parent = tool

local frame = Instance.new("Part")
frame.Name = "Frame"
frame.Size = Vector3.new(0.5, 0.6, 1.8)
frame.CFrame = handle.CFrame + Vector3.new(0, 0.85, -0.4)
frame.BrickColor = BrickColor.new("Dark stone grey")
frame.Parent = tool

local frameWeld = Instance.new("WeldConstraint")
frameWeld.Part0 = handle
frameWeld.Part1 = frame
frameWeld.Parent = handle

local slide = Instance.new("Part")
slide.Name = "Slide"
slide.Size = Vector3.new(0.55, 0.7, 2.3)
slide.CFrame = handle.CFrame + Vector3.new(0, 1.5, -0.5)
slide.BrickColor = BrickColor.new("Black")
slide.Parent = tool

local slideWeld = Instance.new("WeldConstraint")
slideWeld.Part0 = handle
slideWeld.Part1 = slide
slideWeld.Parent = handle

local barrel = Instance.new("Part")
barrel.Name = "Barrel"
barrel.Size = Vector3.new(0.35, 0.35, 2.5)
barrel.CFrame = handle.CFrame + Vector3.new(0, 1.5, -0.7)
barrel.BrickColor = BrickColor.new("Metallic")
barrel.Parent = tool

local barrelWeld = Instance.new("WeldConstraint")
barrelWeld.Part0 = handle
barrelWeld.Part1 = barrel
barrelWeld.Parent = handle

local triggerGuard = Instance.new("Part")
triggerGuard.Name = "TriggerGuard"
triggerGuard.Size = Vector3.new(0.2, 0.5, 0.8)
triggerGuard.CFrame = handle.CFrame + Vector3.new(0, -0.3, -0.45)
triggerGuard.BrickColor = BrickColor.new("Black")
triggerGuard.Parent = tool

local guardWeld = Instance.new("WeldConstraint")
guardWeld.Part0 = handle
guardWeld.Part1 = triggerGuard
guardWeld.Parent = handle

local trigger = Instance.new("Part")
trigger.Name = "Trigger"
trigger.Size = Vector3.new(0.15, 0.35, 0.2)
trigger.CFrame = handle.CFrame + Vector3.new(0, -0.2, -0.4)
trigger.BrickColor = BrickColor.new("Medium stone grey")
trigger.Parent = tool

local triggerWeld = Instance.new("WeldConstraint")
triggerWeld.Part0 = handle
triggerWeld.Part1 = trigger
triggerWeld.Parent = handle

local hammer = Instance.new("Part")
hammer.Name = "Hammer"
hammer.Size = Vector3.new(0.2, 0.4, 0.3)
hammer.CFrame = handle.CFrame + Vector3.new(0, 1.6, 0.7)
hammer.BrickColor = BrickColor.new("Dark stone grey")
hammer.Parent = tool

local hammerWeld = Instance.new("WeldConstraint")
hammerWeld.Part0 = handle
hammerWeld.Part1 = hammer
hammerWeld.Parent = handle

local magazine = Instance.new("Part")
magazine.Name = "Magazine"
magazine.Size = Vector3.new(0.4, 1.0, 0.6)
magazine.CFrame = handle.CFrame + Vector3.new(0, -0.1, 0)
magazine.BrickColor = BrickColor.new("Matte Blue-Grey")
magazine.Parent = tool

local magWeld = Instance.new("WeldConstraint")
magWeld.Part0 = handle
magWeld.Part1 = magazine
magWeld.Parent = handle

local equippedConnection
tool.Equipped:Connect(function()
	screenGui.Enabled = true
	updateAmmoUI()
	if equippedConnection then equippedConnection:Disconnect() end

	equippedConnection = mouse.Button1Down:Connect(function()
		if isReloading or currentAmmo <= 0 then return end
		
		local character = player.Character
		if not character or not character:FindFirstChild("Head") then return end

		currentAmmo = currentAmmo - 1
		updateAmmoUI()

		local headCFrame = character.Head.CFrame
		local spawnCFrame = headCFrame + (headCFrame.LookVector * 4)
		local targetHitPos = mouse.Hit
		local direction = (targetHitPos.Position - spawnCFrame.Position).Unit
		local bulletCFrame = CFrame.new(spawnCFrame.Position, spawnCFrame.Position + direction)

		local success, createdPart = pcall(function()
			return CreatePart(bulletCFrame, workspace)
		end)

		if success and createdPart then
			local distance = (targetHitPos.Position - spawnCFrame.Position).Magnitude
			local bulletSpeed = 450
			local duration = math.clamp(distance / bulletSpeed, 0.04, 0.6)

			Resize(createdPart, Vector3.new(0.3, 0.3, math.min(distance, 4)), bulletCFrame)

			task.spawn(function()
				local runService = game:GetService("RunService")
				local elapsed = 0

				while elapsed < duration do
					local dt = runService.Heartbeat:Wait()
					elapsed = elapsed + dt
					local alpha = math.clamp(elapsed / duration, 0, 1)

					local currentPos = spawnCFrame.Position:Lerp(targetHitPos.Position, alpha)
					local currentCf = CFrame.new(currentPos, currentPos + direction)

					pcall(function()
						MovePart(createdPart, currentCf)
					end)
				end

				local targetHit = mouse.Target
				if targetHit and targetHit.Parent then
					local hitModel = targetHit.Parent
					local humanoid = hitModel:FindFirstChildOfClass("Humanoid")

					if humanoid and hitModel ~= character then
						pcall(function()
							DestroyPart(targetHit)
						end)
					end
				end

				pcall(function()
					DestroyPart(createdPart)
				end)
			end)
		end
	end)
end)

tool.Unequipped:Connect(function()
	screenGui.Enabled = false
	if equippedConnection then
		equippedConnection:Disconnect()
	end
end)