SCP (SOTAR Cam Pin) is a collaboration between Chad Albrecht of School of American Rifle) and Forward Controls Design.
SCP
features a machined dimple on one side of the carrier cam pin, so the
user can always reinstall the cam pin on the carrier in the same
orientation. Cam pin usually wears more heavily on one side, putting
the cam pin in one direction, then another randomly creates uneven wear
on the cam pin, and it becomes sloppy and loose in the bolt. When the
cam pin is installed always facing the same direction, it leaves one
side less worn and more intact, this has the effect of better
maintaining a tight fit of the cam pin in the bolt, and reduces wear cam
pin itself as well as on the cam pin bore on the bolt. Chad Albrecht
is a well respected armorer and instructor, we saw what he has done on a
few cam pins, and it piqued our interest. SCP is one of these "why
didn't I think of it" moments for us, eminently simple and elegant,
it's very much in line with our own design philosophy.
Chad Albrecht of SOTAR explains the benefits of reinstalling the cam pin in the same orientation in this video:
https://youtu.be/VuZ4TgoR1Zk
SCP
is based on the TDP spec cam pin, dimpled on one side, and NP3 or
nitride coated.
AR Build Junkie recently did an interview with Chad Albrecht re: SCP, the article can be found here:
https://www.arbuildjunkie.com/school-of-the-american-rifle-sotar-new-products-partnerships/ 