As far as the ATF is concerned, if it's capable of reducing the sound signature, it's a suppressor. It matters not that you weren't using it in a manner that would reduce the sound signature. It matters not that you had no intent of ever using it as a sound suppression device. Not to sound paranoid, but the ATF is one organization that you DO NOT want to butt heads with. You will lose, I guarantee it.
ding ding ding

A friend recently offered a short barrel upper for an AR to me. Did a bit of investigation, and found out that merely possessing one, with a lower for it which I do, is a felony. Didn't need to be installed atop the lower, just the fact that it was in the house made it illegal. I believe it's called "ready made or ready accessible".The only way to make it legal, was to get the lower registered as an NFA weapon, which will never happen here in NY. I may have slightly misstated something here, but you get the idea.
NEVER mess with the ATF.
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