I used to have a salesman try to sell me fireproof file drawers for Personnel files. The fire wouldn't get inside, but the contents would be charred and useless. Same process on fire rated gun safes. In a fire, your wood and plastic stocks would be scarred at best, ruined at worst. There is also a reason the powder manufacturers put the product in loosely sealed containers. No pressure, no boom. Locked safe = pressure. KABOOM.
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