Is the super duty upper compatible with mil spec AR cam pins of only the Geissele directional one? I can’t find them for sale on their website.

I believe the G uppers are compatible with standard pins, but their proprietary pins are not compatible with other uppers.  If you have a BCG with standard mil spec pin you should be fine.  As always I defer to those that know more than me….

This is correct.

ETA: The asymmetric cam pins only come in complete uppers or rifles. Can't get it standalone or in the standalone REBCG. You can occasionally find a used one. I had a spare as I bought a used takeout REBCG but put it in a standard Geissele upper. I mentioned it on here one time and someone asked if they could buy it. I sold it to him for what I had just bought a FCD cam pin for.

Hey guys, I just wanted to jump in to assist!

Everyone is correct in stating that you can use a Mil-Spec geometry cam pin in our Geissele uppers. The notch in the upper is designed to function with our unidirectional cam pin, but it would be completely functional with a Mil-Spec one. Our cam pin has a raised edge to assist in uniform wear and power through carbon, this requires a relief cut. With that being said, its design is still "Mil-Spec" in nature so you can use a traditional cam pin as well. It just wouldn't take advantage of that feature.

Like others said, you cannot use the unidirectional cam pin in a non-Geissele upper. Since that relief cut is not present, the cam pin will make contact with the inside of the upper and not permit the bolt to lock into battery.

Thanks for the info. Glad to hear we won’t have any issue using regular mil spec cam pins.

Any chance you might be selling the unidirectional cam pin by itself in the future or as an item we can call in for?