ArmsFollow

local plr = game.Players.LocalPlayer
local plrMouse = plr:GetMouse()

local repStorage = game:GetService('ReplicatedStorage')
local updateArms = repStorage:WaitForChild('updateArms')

local char = plr.Character or plr.CharacterAdded:Wait()

local Torso = char:WaitForChild("Torso")
local Head = char:WaitForChild("Head")
local Neck = Torso:WaitForChild("Neck")

local Humanoid = char:WaitForChild("Humanoid")
local HumanoidRootPart = char:WaitForChild("HumanoidRootPart")

local Camera = workspace.CurrentCamera
local RunService = game:GetService("RunService")

local Arms = {char:WaitForChild("Left Arm");char:WaitForChild("Right Arm")}
local Sides = {'Left','Right'}

local NeckOriginC0 = Neck.C0

local ArmsOrigin = {}

for i = 1,#Arms do
	ArmsOrigin[i] = Torso[Sides[i]..' Shoulder'].C0
end

Neck.MaxVelocity = 1/3

local connection

local timing = tick()
local duration = 1/60

local function followMouse()
	connection = RunService.RenderStepped:Connect(function()
		if (tick() - timing >= duration) then
			timing = tick()
			if char:FindFirstChild("Torso") and char:FindFirstChild("Head") then
				local TorsoLookVector = Torso.CFrame.lookVector
				local HeadPosition = Head.CFrame.p

				if Neck then
					if Camera.CameraSubject:IsDescendantOf(char) or Camera.CameraSubject:IsDescendantOf(plr) then

						local hitPos = plrMouse.Hit.p
						local dist = (Head.CFrame.p - hitPos).magnitude
						local dif = Head.CFrame.Y - hitPos.Y
						local tblToSend = {}
						tblToSend[1] = {Neck,Neck.C0:lerp(NeckOriginC0 * CFrame.Angles((math.atan(dif / dist) * 0.5), 0, 0), 1)}
						for i = 1,#Arms do
							tblToSend[i+1] = {Torso[Sides[i].." Shoulder"],Torso[Sides[i]..' Shoulder'].C0:lerp(ArmsOrigin[i] * CFrame.Angles(0,0,i == 1 and (math.atan(dif / dist) * 1) or -(math.atan(dif / dist) * 1)), 1)}
						end
						updateArms:FireServer(tblToSend)
					end
				end
			end
		end
	end)
end

updateArms.OnClientEvent:Connect(function(tbl)
	print('UPDATING ARMS')
	for i = 1,#tbl do
		tbl[i][1].C0 = tbl[i][2]
	end
end)

script.Parent.Equipped:Connect(followMouse)
script.Parent.Unequipped:Connect(function()
	connection:Disconnect()
	local tblToSend = {}
	tblToSend[1] = {Neck,NeckOriginC0}
	for i = 1,#Arms do
		tblToSend[i+1] = {Torso[Sides[i]..' Shoulder'],ArmsOrigin[i]}
	end
	updateArms:FireServer(tblToSend)
end)