Originally Posted by MikeJK
Assembly is taking parts built by others and putting them together. Building is taking raw material and making the parts then putting them together.
I'm a sissy. I prefer factory built/assembled ARs (uppers mostly).
You really should read Spitty's build thread, pretty inspiring and impressive
.... might toughen you up some
With that said I am in favor of assembling your own - if you have played with legos you can assemble an AR. If not than decide on what you want to do and accomplsih with the AR, then decide on a price point. From there you will easily get a dozen or more manufactures to compare. Then it's just a matter of comparing spec's and reviews to get what you want and what you feel is important to you.
Oh, don't forget to read the stickies and build threads - more information contained in them than one could possible ask for