Serial no. L032XXX puts this as a 1991 manufactured receiver. This lower is complete and ready to go, with a 6 position stock that has the Bushy snake logo on the side. Condition is very nice as you can see in the pics.
$325 shipped to your FFL. IM or email me.
EDIT: After contacting Bushmaster, I have discovered that this lower did not leave their factory as a complete rifle. Since it is impossible for me to confirm that it existed as a complete rifle prior to Sept. 1994, I cannot offer it as a pre-ban lower to ban states. Therefore the price has been lowered. See below for an option to buy this as a complete rifle at a good price.
EDIT: Confirmed sold pending funds 9-21-05.