Per the two chief engineers on the Top Gear video - the CT is not bulletproof, it's "bullet resistant". They openly said the 3mm SS will only stop subsonic rounds. That's why they used an old Tommy gun that fires subsonic 45 caliber rounds, and a 9mm that was loaded with subsonic rounds. That's a nice way of saying those videos are click-bait for the fanboy base basically. They literally said all of this directly in the video, that any supersonic round will penetrate the steel. Newsflash, many pistols and almost every rifle in existence fire supersonic rounds with higher muzzle velocities these days. Any version of the AR-15 with 223/556 rounds, with muzzle velocities ranging from 2500-4000fps leaving the barrel, would turn the CT into swiss cheese in other words.