这里有说明
https://www.80percentarms.com/pages/faq
要在7月1号前做好,还要加serial number,不过这个号码在7月1号前你可以自己随便起,但是要符合ATF的serial number要求,如果你是7月1后买lower 80%就要向ATF先申请serial number才能开始动手弄。
WHAT ARE ATF REQUIREMENTS FOR SERIALIZING A LOWER?First, home built rifles for personal use are not required by federal law to have serial number. However, some people wish to engrave one anyway, or you may be required to engrave one if you live in California (see above). For firearms manufactured in the United States by a commercial firearms manufacturer, federal law requires the following information to be present: - A serial number (must not duplicate another serial number you have used before)
- Caliber. Most people write “Caliber: Multi”.
- Manufacturer's name. Generally this would be your first and last name.
- Manufacturer’s city and state. This would be the city and state in which you live.
- (Optional) If you have decided to assign a model number to your 80% lower, you must engrave it onto the lower. If you have not elected to make up a model number, you do not have to engrave one.
The above information must be engraved to a depth of .003 inches and the text size must be at least 0.125 inches high.
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