Weapon GUI help?

I've been trying and asking all I know but it just seems to be impossible to make. I'm trying to make a Weapon GUI. As simple as that sounds, it doesn't appear to be. Within the game, there are badges that can be collected. Once a certain badge is collected, the weapon should be equipable by a button in the GUI. However, there doesn't appear to be a script that exists or is even possible to allow this. I'm assuming it would follow along the lines of a gamepassservice, but how would that work? The closest I've come to making this is the following, but it doesn't even work. Any options? My attempt ~

local ID = 158694379
local badge = game:GetService("BadgeService")
local player = game.Players.LocalPlayer

function find(userid, badgeid)
    if badge :UserHasBadge(userid, badgeid) then
        local clone = game.ReplicatedStorage.GravityCoil:clone()
        local clone2 = game.ReplicatedStorage.GravityCoil:clone()
        clone.Parent = player.Backpack
        clone2.Parent = player.StarterGear
    else
        script.Parent.MouseButton1Click:Destroy()
        --script.Parent.BackgroundColor3 = Color3.New(.5, .5, .5)
    end
end

script.Parent.MouseButton1Click:connect(function() find(player.userId, ID) end)