I have a stripped lower that I'm considering for an AR-pistol project. When I did my 4473, I probably checked the Rifle box because that's what I was thinking at the time. What do I need to do to keep this a legal build? Sounds like I can have it reclassified but is that a major hassle/expense? I guess the other option is to just start fresh with a new lower and check the Other box. None of this NFA stuff makes sense to me...but you all already know that.