>>64287587
The Italian surp plates are good, I have two of the neck plates myself. The problem with them though is that they're first-gen PE and get domed by 5.56 M855, the "green meanies" so popular on social media. If you're dealing with ARPs, which are now common, you need to expect M855.
The plates are however equivalent to Level III and people have tested them to stop 7.62x51mm M80, so basic handgun ammunition (5.7 SS190 is sketchy but depends on velocity) and shotgun slugs are fine. I've heard from one anon that he got 7.62x39 mild steel core to pierce, which is a problem if Dracos are still around.
Preformed hardened steel fragmentation will pierce if it's large enough and oriented correctly but that's a crapshoot. Tungsten frag is even worse but if we're busting out tungsten fragmentation explosives then things are absolutely beyond gone to pot.
>>64287608
PASGTs are roughly equivalent to IIA. They're good and preferable to D / C-grade Chinese fake IIIA (you can roughly sort everything from China into a four-grade quality system).
>>64287635
Yes but the areal density is going to be excessive to reliably stop .30-06 M2AP at 2,910ft/s. Obviously way better than nothing if you've got jack shit and need armor tomorrow.
If your ass is to the wall though get some LAPG full-coverage edge-to-edge Level IVs for $290 a set. That's the cheapest workable Level IV on the market. Anything cheaper like the Highcom 4SAS4 or RMA 1155 (both $200/set on a really good sale) is going to have serious drawbacks. If you can spare more the Hesco 4403 is superior for $425/set.
>>64287640
Yes but the surplus scene isn't what it used to be. You can get surplus ECHs for $500 though that provide credible protection against 7.62x39 ball and heavier frag.