Check the inside of your bolt carrier. Last Olympic I cleaned up for a friend didn't have any chrome lining in the carrier where the bolt operates. Lube will be very important, and almost impossible to keep in that area because of all of the bolt travel and heat in that area. Probably a contributing factor to his broken bolt as well as the broken bolt in my first AR, which was an Olympic.
I do like the A1 uppers for a nice simple build. Hard to jack up those sights. Keeping it simple keeps it light and handy.