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AR15.COM
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6/15/2007 6:28:02 PM EDT
i need some advice please. i have a sbr that has been registered for some time now. on my paper it has the barrel length marked as 14". my question is can i put a 10" upper on it? or do i have to register it again?
6/15/2007 7:21:50 PM EDT
[#1]
It would be fine if you put a 10" upper on it.  The ATF requests that you notify them of the change to the firearm, but it is not compulsory.  If the change is permanent, I would notify them, but if you plan on swapping uppers frequently, I wouldn't worry about it.  You do not have to "re-register" the weapon.
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