I have just browsed this site and many others on the internet and found many people offering items breaking the 1994 "assault weapons" ban and most likely no one even knows it. While everyone pretty much agrees that the only way an AR15 is a preban is that if it was assembled into a complete rifle or sold as a complete kit form with all the necessary parts to build a rifle prior to September 13th, 1994, many do not realize that prebans can become postbans. In fact, the "preban lower receiver" doesn't mean anything anymore in the eyes of the ATF. According to the ATF, only "grandfathered" assault weapons are still allowed. Thus, any modification to your preban AR would technically have to be a "repair." and such. If you separate the upper and lower, then sell off the lower as a "preban lower"? Guess what? It automatically becomes a POSTBAN. According to ATF, the history of the receiver has NOTHING to do with it. If the preban gun was torn down and the lower receiver was transferred, it's a receiver, not a complete gun. Thus, when the next person drops the preban upper on it, they just violated the 1994 Crime bill by assembling an "assault weapon" after Sept. 13th 1994. I know this interpretation is wacky and weird on how prebans can become postbans. However, ATF has their interpretations and I urge everyone to follow their interpretations and the law or face the bitter consequences of the law and the wrath of the authorities. Most law-enforcement officers are not even aware of this interpretation and I've seen officers selling "preban" lowers to other people not knowing that the receiver has just become a postban. In addition, don't think that there's no proof that the gun wasn't transferred as a whole gun. On the yellow form you fill out for the transfer, if it's written as "receiver"? There's records of that transfer as a receiver. Thus, you better not put a preban upper or telestock on it. Of course no one agrees with these silly ludicrously absurd laws. Most people in the ATF probably don't even agree with them. Actually, most ATF guys I've talked to are good guys against lots of this crap. However, the law's the law....no matter how absurd and stupid they are, we must abide by them or suffer the consequences.