The 7.62×39 Complete Bolt and Carrier Group is Nitride coated and Chrome Lined. The Carrier is made from 8620 steel, and the Bolt is made from 9310 steel and Nitride coated, MPI Tested. The 7.62×39 Bolt and Bolt Carrier Assembly comes complete with Cam Pin, Firing Pin and Firing Pin Retainer.
*** The use of steel case and bi-metal jacketed ammo is not recommended with this product.***