How can I check for a specific value in any gear? [Un-Answered]

There are 3 different types of gears; Melee, Ranged, and Special. Each gear has a StringValue which value has either Melee, Ranged, or Special. When they go to purchase an item in the shop, I want the gear in the player's Backpack or Character(if they're holding it) to be replaced with the new gear that they purchased. Here's the script:

local player = game.Players.LocalPlayer
local cash = player:WaitForChild('leaderstats').Cash
local amount = 400
local weapons = game.ReplicatedStorage.Weapons
local tool = weapons.GravityDisruptor
local indexText = script.Parent.Text

script.Parent.MouseButton1Click:connect(function()
    if cash.Value >= amount and not player.Backpack:FindFirstChild('GravityDisruptor') or player.Character:FindFirstChild('GravityDisruptor')then
        --They don't have it
        local newTool = tool:Clone()
        local newTool2 = tool:Clone()
        newTool2.Parent = player.Backpack
        newTool.Parent = player.StarterGear
    else
        script.Parent.Text = "Purchased Failed!"
        wait(3)
        script.Parent.Text = indexText
    end
end)

script.Parent.MouseEnter:connect(function()
    script.Parent.Parent.Parent.Parent.ProductImage.Image = "rbxassetid://"..script.ImageValue.Value
    script.Parent.Parent.Parent.Parent.Description.Text = script.Description.Value
    script.Parent.Parent.Parent.Parent.ProductTitle.Text = script.Title.Value
end)

script.Parent.MouseLeave:connect(function()
    script.Parent.Parent.Parent.Parent.ProductImage.Image = "rbxassetid://"
    script.Parent.Parent.Parent.Parent.Description.Text = ""
    script.Parent.Parent.Parent.Parent.ProductTitle.Text = ""
end)