pick and choose you really can't go wrong.

biggest thing: look for someone who offers lifetime warranty. i.e. RRA, Anvil Arms

I have a RRA, 2 spikes, a doublestar, 3 anvil arms (soon to be 3 more) and they are all very good quality.

I have heard and actually seen a few problems with Superior arms lower receivers if you are looking at doing a build.


Another good one for a great price is Del-ton

Talk with alan at machine gun tours. He usually has sabre defense as well. I don't know much about these but have never heard a bad thing about them. Support the local guys if you can