I've used DPMS, RRA, Stag, Bushmaster.
I prefer the Stag/RRA (CMT) or Bushmaster over the DPMS (here it comes, probably the only time I'll say this) for the fit and finish. The DPMS kits are a bit "rougher". IMO
For the most part I buy what I can find IN STOCK when I'm putting a lower together.
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