I'm making a gun with animations and I'm having mutliple problems, help?

I'm making a gun, and decided to add animations and make the player's arms follow the mouse. I have a problem and a question.

Firstly, I'm having a weird problem, I have the gun, but when I duplicate it, the second one's "follow camera" system doesn't work.. Here's the code

local plr = game.Players.LocalPlayer

repeat wait() until game.Players.LocalPlayer.Character
local char1 = plr.Character
local Anim = char1.Humanoid:LoadAnimation(script.Parent.Idle)

local RightArm = char1.Torso["Right Shoulder"].C0
local LeftArm = char1.Torso["Left Shoulder"].C0
local Neck = char1.Torso["Neck"].C0

local ChangeVariable = false

repeat wait() until game.Players.LocalPlayer.Character

local char = plr.Character
local m = plr:GetMouse()

game["Run Service"].RenderStepped:Connect(function()
	
	if script.Parent.BoolEquipped.Value == true then
		
		local c = game.Workspace.CurrentCamera
		char.Torso["Right Shoulder"].C0 = CFrame.new(1,0.5,0) * CFrame.Angles(-math.asin((m.Origin.p - m.Hit.p).unit.y),1.55,0)
		char.Torso["Left Shoulder"].C0 = CFrame.new(-1,0.5,0) * CFrame.Angles(-math.asin((m.Origin.p - m.Hit.p).unit.y),-1.55,0)
		char.Torso["Neck"].C0 = CFrame.new(0,1,0) * CFrame.Angles(-math.asin((m.Origin.p - m.Hit.p).unit.y) + 1.55,3.15,0)
		
	else
		
		local c = game.Workspace.CurrentCamera
		char.Torso["Right Shoulder"].C0 = RightArm
		char.Torso["Left Shoulder"].C0 = LeftArm
		char.Torso["Neck"].C0 = Neck

	end

end)

script.Parent.Unequipped:Connect(function()
	
	char.Torso["Right Shoulder"].C0 = CFrame.new(0,0,0)
	char.Torso["Left Shoulder"].C0 = CFrame.new(0,0,0)
	char.Torso["Neck"].C0 = CFrame.new(0,0,0)
	
end)

script.Parent.Equipped:Connect(function()
	
	Anim:Play()
	
end)

script.Parent.Unequipped:Connect(function()
	
	Anim:Stop()
	
end)

I also have a question, does anyone know how can I make it so that the character's arms follow the mouse, but in a server script?

It's not recommended to use a remote event to fire the mouse position to server, but if you want to do so, fire the mouse position every 0.5 seconds so it won't take your performance by a lot. The only downsides is it will take more performance than using local script to control head movement instead of remoting it to the server, and the head movement won't be smooth