Anyone have input on their ARs? I found a site that has a "bargain bin" special for them... They say lowers are a mix of CMMG, DPMS, and Doublestar. Complete setup for $570 and $15 shipping. I've seen a bunch of people order them from another site I'm on and have been very pleased... This is my first AR and I'm really not sure what I'm going for. Every review I've read for CMMG has been really good. Just thinking that for under $600 shipped, I get a complete AR. Anyone?