From the press release:
MGI, home of the only, truly modular semi-auto rifle system in the world today is proud to announce the Enhanced Reliability Firing Pin & Bolt System.
MGI’s new Enhanced ReliabilityFiring Pin & Bolt were designed to increase detonation reliability when shooting the 7.62×39 round in converted AR-15 style rifles. The MGI Firing Pin & Bolt system closely mimics a true AK 47 firing system for greater reliability and control. In fact, Wolf Performance Ammunition highly recommends using the MGI Firing Pin & Bolt system when firing 7.62×39 ammo.
For many years, shooters have been trying to increase the reliability of their 7.62 AR’s. There have been many attempts ranging from removing metal from the rear of the bolt, or from the flange of the firing pin, in an effort to get more penetration into the harder primers used in many 7.62 type rounds. In truth, the problem was not so much a matter of penetration as a matter of displacing enough mass in the primer to insure detonation.
MGI has combined a harder firing pin with a magnafluxed mil-spec bolt and D-fender D-ring to increase extraction reliability.