first ar

So I’m doing my first build and was inspecting the lower receiver. I noticed a orange sand like material in and around the pivot pin channel. It cleaned up with a cleaning cloth. I cleaned inside the channel further with a toothpick and there was more orange and black debris in the channel...

Hi folks, As the title says, I'm putting together my first AR build, mainly from PSA parts. This will be my first AR, and actually my first center fire rifle. As my first and only (for now), it will be a "jack of all trades" of sorts. But realistically it will mostly be for plinking. Our...