Would you be interested in a slightly used (less than 100 rds) Colt HBAR upper?
Complete A2 upper with bolt carrier and charging handle, heavy barrel, 1:9 twist. I had it modified to look pre ban. It has an A2 flash hider and the front tower was replaced with an FN with a bayonet lug (the new Colt FSTs don't align with the taper mounting pins). Colors all match. $565 delivered.