I discovered these sorts of plates, or I guess you could call them panels, while watching a MrGunsnGear video on a Botach Battle Steel panel that was called Level IIIA+. And basically it was a poly plate but made much thinner than the stuff they make for rifle threats. And what they ended up with was something the same weight as a IIIA soft panel but that could also stop stabbing thrusts and higher velocity pistol caliber hits.
Apparently even Hesco makes something similar which is their P210 model. Considering that one of these plates/panels weighs exactly one pound (10"x12" shooters cut) and is about a quarter inch thick, these seems really impressive for what they can do. I'm assuming it can't handle steel core versions of 5.7mm, since larger poly plates fail against M855 then a scaled down poly plate probably fails against a scaled down M855.
Does anyone know if any testing has been done, whether by a real laboratory or even just YouTubers (because some guy shooting at X with Y in his back yard and posting it on YouTube may not be ideal data, but it is data), on whether these sorts of panels can stop subsonic 300 Blackout, various kinds of 5.7mm, or 44 magnum and 357 magnum from rifle length barrels? I'd consider buying a P210 and testing it myself to find out, but I don't live in an area where I can easily just go out to the woods and shoot my guns without a bunch of nearby Democrats shitting their pants and calling the police. If they do indeed stop subsonic 300 blackout, 44/357 magnum from lever action rifle velocities, 9mm from PCC velocities, and most non-AP-style 5.7mm rounds, then this is basically the perfect lightweight low profile armor.
It would seem to make a worthwhile addition to ultra lightweight gear setups where you would normally only use a chest rig instead of a plate carrier. If you can protect your vitals from everything other than rifle threats for only one pound added weight, what's the logic of chest rigs that forgo any protection at all?