www.ar15.com/content/page.html?id=24This is a great place to start.
To sum it up:
In NY we are NOT allowed to have any of the evil features on a POST ban rifle. (Flash suppressor, bayo lug, telescopic stock)
In order for your lower to qualify as a TRUE PREBAN it has to be:
A) Made on or before Sept 14th 1994
B) Has to be assembled as a COMPLETE rifle on or before this date.
C) All this needs to be verifiable. (You must sign a statement saying that you built it, you can have a receipt of sale to prove it was a complete preban, etc....)
The problem we run into in the banned states is people saying it's a preban based on serial number. Serial number does tell what year it was made but how do we know it was a complete rifle? Some lowers were sold as just lowers.
It gets tricky, if you have no proof of it as being a true preban I wouldn't sell it as one. You could put someones ass in a sling.
If you have anymore questions, feel free to IM me.