Where is that in federal law?
That may be a requirement before importation into the U.S., similar to the ATF "points" system to get imported Glocks into the country before Glock built a factory here. After purchase in the U.S., you can do whatever you want.
If I recall correctly, that was a part of the 94 assault weapon ban and it went away in 2004. You can have pistol grips and extended tubes and all the "ugly evil stuff".
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