I don't know if I totally see it that way. So you've got a US compliance parts count that you have to maintain to keep a "gun" legal. Does this not also refer to the magazine that is in it too? Are the parts in the magazine exempt from being added to the total count? Could the ATF, pull your magazine out and say your count is too low? There has got to be some literature/letter from the ATF which explains this point better. Granted, if they can pull the mag out and say my count is too low, I won't be adding these in to my parts count. But, if they do count I will definitely be adding them to all of my magazines. Does anyone know a definitive answer on this?