Beyond the AR 500 steel, you need to coat it with something that will catch the shrapnel of the ballistic so the splatter is also controlled. Do a internet search, I dont think rhino liner will do the job.
If it were me I would spend $189 for the carrier and the plates.
I use Keepass, and they have a KeepassX for mac/linux. Not sure if the databases can be shared between the two. Here is a list of some below.
Deport then block the refresh and the spammer will go poof!