If you want to contribute to what you think or read from good sources, are good suggestions for a new member wanting to buy or build their ARs, this is the thread for it.
Here is a starting reference on the subject that should be a must read to anyone thinking about an AR15 rifle. Click on the first link (from the link below) pointing to the Google Document.
http://www.m4carbine.net/showthread.php?t=6642