Amen to the above. If you choose NOT to build AT LEAST your own lower and then have to learn about it for whatever reason in the future, you will be seriously kicking yourself in the ass for not doing it the first time. Yes, there is a high number of parts, but they are broke down into a smaller # of steps and you'll know how to diagnose a good ammount of FC issues.
I have a buddy that was complaining to me about his older BM being a POS. I asked what was wrong, he said the take down pin keeps falling out, the gun never did fit right and the trigger sucked, he was ready to sell it for nothing and start over.. . HOLY CRAP! I told him to let me see. I took out a punch, reset the pins detent/spring, replaced his hammer spring and installed an accu-wedge in ~5min. He couldn't believe it.
That was damn near a MAJOR loss for NOTHING. All because the town we're from (I moved, for now) is small and NO BODY messes with black guns. Either you're a hunter or a IDPA shooter, FOR NOW. Small towns take a while to catch up w/ things, anyways BUILD IT, BUILD IT, BUILD IT, you won't be sorry.