Yes Armalite did make A2 SR-25 compatible upper at one time...like 8+ years ago, they never made a flattop version.
My bitching is that knights Armament never made a replacement upper for the SR-25 and still do not. So what's up with this? I've been waiting since 1995!
Originally Posted By Sinister:
Armalite made and carried them for years but demand wasn't there. They eventually they sold them at clearance for $150 apiece.