Geissele Super 42 Receiver Damage

[RetroRevolver77]

Had the same thing happen when I used a drop in Ares piston conversions in my LMT's. Then switched to a POF roller cam with a heavier buffer in each but even the roller cam pins still ate their way through that area regardless. Personal observation from that situation is that the AR should have been designed with some type of steel insert in that cam pin area.

[tom12.7]

Torsional or twisting stress is the concern here. We can reduce it with changes in the timing of the pressure events to reduce the twisting force to an extent. Some wear in this location is normal, excessive wear in this location indicates that we are not timing the system as well as we could be.
Be careful to remember that rounded or roller applications reduce the contact area for that surface to a much smaller area. That results in a higher pressure applied to a smaller contact surface rather than the same force applied to a larger area. If you look into the anodized layer over the base 7075, the layers have different properties. For this system, we could look into ways that attribute to either, or to help avoid the ways that are detrimental.