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Remember to register it on the F4 as both 9mm and 223 or you'll need to send a letter of intent to the NFA branch to update your NFA status.
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Multi calibers is OK from what I've heard.
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You never know what is going to slip through different examiners at the NFA branch but “Multi” and a range of lengths are not ok anymore. You can list additional calibers in 4h of the form 1, you should just have the upper described on the f1 handy at all times.
You'll just waist time turning in something wrong so just give them a call at 304-616-4500 with your questions.