I saw this post on another forum:
Anyone have problems making gun purchases this weekend?
I had a rifle shipped to my FFL, went to pick it up Saturday morning, filled out my paperwork and then they came back and said the Fed background check system went down and couldn't process me until it came back up.
They said it was scheduled to be down Sunday for regular maintenance but it went down on Friday for awhile and then again Saturday. Ran into a buddy Saturday afternoon and said he was in the process of buying a pistol when it went down.