For sale: two Bushmaster Pre-Ban CAR 15 barreled uppers. These both have the 11.5 barrels with the permantly affixed 5.5" flash suppressor. One of them has an A-2 upper, the other one has an A-1. Both are used, but in excellent shape and include bolt, carrier etc, everything you need to complete your shorty project. $375 each plus shipping.
you can see the item here: