To the OP, read this. It describes the answer to your question. The only thing that has changed since it was written, is that Remington now has a contract also with Colt and FN to produce the AR's to the military. They are as good as any mass produced rifle. You can buy a rifle that has more time in fit and finish with closer tolerances, but they are more expensive.
" The strongest reason for the people to retain the right to
keep and bear arms is, as a last resort, to protect
themselves against tyranny in Government...." - Thomas Jefferson