Gun Selection screen help

No, no. When you make a 'gun selection' GUI, you simply insert the gun into the character for an instant forced equip. For example, this LocalScript would go in a TextButton.

function onMouseButton1Down()
    gun = game.ReplicatedStorage.Gun
    gun:Clone().Parent = game.Players.LocalPlayer.Character
end

script.Parent.MouseButton1Down:connect(onMouseButton1Down)

Obviously, you would have to rework it a little depending on your situation.

Sidenote: Sometimes you lose parts when cloning Tools into the Character. I'm not sure why this happens, but it does, so be careful. You may be able to solve this by putting it in the Backpack for an instant before reparenting to the Character.