For lower receivers, it doesn't matter much. In spec is in spec. Some have tighter magwells than others; I have some CMMG lowers that are great, I have a Superior Arms that is just fine, but older model Pmags don't drop free from that one.
I'd steer clear of Vulcan/Blackthorne/Hesse and Olympic- too much chance that things might be out of spec (Olympic's stuff tends to be accurate, but hit and miss in quality, the other company is just pure garbage).
As I said, I've used CMMG, Superior Arms, I have an Aero Precision at home waiting for me to build it up. There's really no shortage of decent lowers out there.
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