One of the guys ( elohim1) on AR15.com has some stripped grade 1 ($79) and grade 2 ($69) FN A2 upper for sale.
They do not have forward assist or dust cover,( they have been removed) but are a good buy. I am going to order a few to put back for later.
If you buy 2 they are cheaper.
The A2 rifle is becoming the Reto AR, so get ahead of the curve on these now.