Yes it will work. Google " Will m16 BCG work in a AR15"
According to the manufacturer the Radical Firearms RF 223/5.56/300AAC/22Nosler M16 BCG, Melonite Bolt Carrier Group is MPI and HPT.
Melonite is a heat treating process that protects the metal from corrosion and also lowers friction.
Yes it is.
Yes, this BCG will work with that caliber. The .223 Rem, 5.56 NATO, 300 AAC, and 350 Legend all use the same bolt.
Yes, it is.
It weighs approximately 11.6 oz.