These are just - Radical Firearms RF 223/5.56/300AAC/22Nosler M16 BCG, Melonite Bolt Carrier Group (BCG)

Bought a Radical firearms ar and from the point of receiving it the bcg would not even chamber a round. Customer service was aweful but when I finally got a replacement (so I was told) that was as defective as the first. I then bought an aero precision. That worked flawless. Rest of gun was nice but Radicals bcg's are junk if you ask me. Customer service does nothing to help