I have been researching the AR15 pistol myself and learned that after following all the NFA rules it does not matter much because some states might have further strict laws on Ar15 pistols. It's important to research fed law and your state laws. Most guys are quoting fed law and they may live in a state that mirrors fed law on AR15 pistols but a state can impose further restrictions. From what I have been reading Levant you are correct you can't bounce back and forth on pistol upppers and rifles uppers on a AR15 lower. The language outlined from BATF can be pretty confusing.
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Last edited by Hairbag; January 22, 2013 at 12:34 PM.