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Expert Answer
No. The LANTAC M-SPEC Bolt Carrier Group is manufactured from 8620 steel, case hardened and hard turned/ground so that internal dimension is exact to mil specifications. It is then QPQ Nitrided rather than Type M Phosphated to give increased corrosion resistance, durability and performance. The Bolt is machined from Carpenter 158 or 9310, shot peened and hard turned as per the military spec. Each BCG is further fitted with a Lantac CP-R360 domed head cam pin, which are precision machined from 17-4PH stainless steel, hand polished and hardened to H900 condition, this further reduces friction and wear within the upper receiver.