I guess I am confused....if the plates are for "SHTF", then they are not going to be worn every day. If you are not in LE, they are not going to be bouncing around in the back patrol vehicles with another 300 lbs of gear crashing into them. They are definitely not going on a military deployment where they are going to get dropped on steel decks, banged into steel hatches on armored vehicles, and generally abused by grunts. So why are you worried about durability and annual non-destructive testing?
AMI Tac3S is a solid mid-priced plate--there are many other very capable plates that will also stop M193 and M855, but costs can be up to $1500 per plate.
NINE different plates capable of stopping both M193 and M855 are listed in this thread:
https://www.m4carbine.net/showthread.php?t=32839; that thread does not even include things like the BAE SOLAR plates or the Velocity Systems PBZ plates which also work--how many options do you need?
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