It's not thick enough to stop high-powered rifle or machine gun rounds, but does seem able to stop 9 MM, .45 caliber and some shotgun rounds. More Cybertruck Versus Bullets ...

I would have rather seen them shoot it with a .223/5.56mm [bullet diameter inches/mm] or 7.62x39mm [bullet diameter x cartridge length] as these are more common than the Tommy Gun." ...