According to this page,
How to Fill out an ATF FORM 1 For NFA Title II Firearm Manufacturing (5320.1)
you can't put caliber Multi on a form 1. How does this work then? The website makes it sound like you just attache a paper that says, "I'd like to shoot 300blk too." I plan on putting in a couple of stamps and would like to have 5.56 and .300BLK as options.
How to Fill out an ATF FORM 1 For NFA Title II Firearm Manufacturing (5320.1)
you can't put caliber Multi on a form 1. How does this work then? The website makes it sound like you just attache a paper that says, "I'd like to shoot 300blk too." I plan on putting in a couple of stamps and would like to have 5.56 and .300BLK as options.