I have 1/2" fixed Lexan portlights on the pilothouse and coach house that would likely stop small arms fire, but that's supposed to be "blue water grade". I replaced 1/4" Plexiglas fixed ports on my sloop with the same 1/4" and I would hesitate to go thinner than than, even with Lexan. I would get 1/4" as others are advising.
Opening ports: tempered glass.
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