local args = {
    [1] = game:GetService("ReplicatedStorage").ShopEntries.RevolverSkins["Deagle Case"]
}

game:GetService("ReplicatedStorage").Interactions.Server.BuyShopItem:InvokeServer(unpack(args))
[[-- Change "Deagle Case" to "Sugar Case, Fury Case, Historic Case, Luger Case, Music Case, Seer Case, Sniper Case]]