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So I'm filling out my first form 1, for an sbr in 5.56 that I want to make. One of the questions on the first page of the form 4j says: type of destructive device (check one box): then you can either check firearm or explosives. I didn't think that an that sbr was a destructive device unless you bored out the barrel to greater then a half inch. But when it says "check one box" it makes me think that I need to check one or the other. I've googled like crazy and can't find an answer, any help would be greatly appreciated.
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