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CiTY_HuNTeR 发的那个链接就是咯.
For example, let’s say your existing SBR has a barrel length of 10.5 inches, an overall length of 29 inches, and a caliber of 5.56 mm(这个就是你注册的那个尺寸).
You would like to change out the upper receiver to convert it to 300 AAC Blackout with a 9 inch barrel. In addition, you want to be able to use a 7.5 inch, 5.56 mm barrel in the future(这个就是你多出来想要随时替换的尺寸).
You can lawfully amend your tax stamp to include multiple configurations. Simply send a letter to the ATF stating the details of each additional configuration, including barrel length, overall length, and caliber.(这个就是你写信给ATF补充的)。
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