How do I make a weld from a tool?

Well, I made a gun in ROBLOX. Multiple in fact. And I want to make it weld your arms to make it look more realistic, welding works. Just the unwelding. To unweld the gun I used Weld:Destroy()

The only problem now is that your arms fall off of your body. Also, this weld is just some quick one I made, not one which had time put into, what I'm asking is can someone help me fix this?

Ammo = 5

damage = 50

AbleToFire2 = true

AbleToFire = true

enabled = true

Player = game.Players.LocalPlayer
mouse = Player:GetMouse()

script.Parent.Equipped:connect(function(eventMouse)
    Player:WaitForChild("PlayerGui").ScreenGui4.Frame.Visible = true
eventMouse.Icon = "rbxasset://textures\\GunCursor.png"

        local RightArm = Player.Character:WaitForChild("Right Arm")
    local Torso = Player.Character:WaitForChild("Torso")
    local Weld = Instance.new("Weld")

    Weld.Part0 = Torso
    Weld.Parent = Torso 
    Weld.Part1 = RightArm
    Weld.C1 = CFrame.new(0, 0.5, 0.5) * CFrame.Angles(math.rad(-90), 0, math.rad(60))
end)

script.Parent.Unequipped:connect(function()
    Player:WaitForChild("PlayerGui").ScreenGui4.Frame.Visible = false
    local Weld = Player.Character.Torso:WaitForChild("Weld")    
    Weld:Destroy()
end)

script.Parent.Activated:connect(function()
    if Ammo > 0 and AbleToFire == true then
if AbleToFire2 == true then
    AbleToFire2 = false
Bullet = Instance.new("Part", workspace)
game.Debris:AddItem(Bullet, 10)
Bullet.CFrame = Player.Character["Right Arm"].CFrame * CFrame.new(-8, 0, -9.5)
Bullet.CFrame = CFrame.new(Bullet.Position, mouse.Hit.p)
Bullet.Size = Vector3.new(1, 1, 1)
Bullet.BrickColor = BrickColor.new("Really black")
Bullet.Shape = "Ball"
Bullet.Transparency = 1
Bullet.Name = "BarretBullet"
Bullet.Touched:connect(function(hit)
local h = hit.Parent:FindFirstChild("Humanoid")
if h ~= nil then
    local Player2 = game.Players:GetPlayerFromCharacter(hit.Parent)
    if Player2.TeamColor == Player.TeamColor then

            else
    hit.Parent.Humanoid:TakeDamage(damage)
if enabled == false then
    enabled = true  
    enabled = false
    wait(0.1)
    enabled = true
wait(1)
Bullet:Destroy()
end
    end
end
end)

local Vel = Instance.new("BodyVelocity", Bullet)
Vel.Velocity = Bullet.CFrame.lookVector *100
Vel.MaxForce = Vector3.new(math.huge, math.huge, math.huge)
script.Parent.GripPos = Vector3.new(0, -0.4, -1.8)
wait(0)
script.Parent.GripPos = Vector3.new(0, -0.4, -1.9)
script.Parent.FireSound:Play()
Ammo = Ammo - 1
Player.PlayerGui.ScreenGui4.Ammo.Value = Player.PlayerGui.ScreenGui4.Ammo.Value - 1
AbleToFire2 = false
wait(2.5)
AbleToFire2 = true
wait(.2)
Bullet.CanCollide = true
end
end
end)


mouse.KeyDown:connect(function(Key)
    if Key == "r" then  
if Ammo <= 4 then
if AbleToFire == true then
    AbleToFire = false
AbleToFire = false
    local Animation = script.Parent.Reload
    local AnimationPlay = Player.Character.Humanoid:LoadAnimation(Animation)
    AnimationPlay:Play()
script.Parent.ReloadSound:Play()
wait(2.5)
        Ammo = 5
            Player.PlayerGui.ScreenGui4.Ammo.Value = 5
            AbleToFire = true
end
end
end
end)

Remember the arms drop off of your body, after you unequip the gun.