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10/7/2009 4:00:27 PM EDT
Maybe this is the wrong place for this...... but,

Who determines what the serialized portion of the firearm is? Reason I ask, I was reading an article about the FN SCAR, and it stated that the upper receiver was the serialized portion. It has a lower pretty similar to the AR that contains the magwell and FCG. The only difference is that it looks like the buttstock is on the upper. Why are they different?

I was thinking it would be a terrible pain to have the upper serialized on an AR, because it would lose all of the modularity that helps makes it such a great rifle.
10/8/2009 9:19:57 AM EDT
[#1]
The ATF decides. How they come up with their decision is anybody's guess.
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