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My " gunroom" is not in the building i live in . the thinnest wall is 8" of poured concrete with 3/8 rebar as reinforcement . the other two walls i have no idea on other than they are natural rock and about 20" thick . To seal the area ( the last " wall " ) is a combo of 1/2 and 1/4 mild steel . I used 1/2 to anchor to the mollys , and welded it to the 1/4 sheet . The door is 1/4 secured with a built hasp and padlock . The entire thing is smaller than a walk in closet and used materials i had on hand .
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