It has been a while since I mentioned that Brownells was going to be producing their own M16 Bolt Carrier Group (BCG). It is now available.
The Brownells M16 BCG has everything you would expect to see in a quality bolt carrier group. The bolt is machined from Carpenter 158 steel, MP Inspected, HP tested (not listed in specs but bolts are marked), and shot peened. The extractor comes with a black o-ring already installed and a proper insert. The carrier is machined from 8620 steel. The bolt carrier key is staked (though initial reports have said that the staking could be more aggressive) and the interior is chrome lined.
Check out the new M16 Bolt Carrier Group at Brownells.com.