Hello - I'm thinking of picking up either a Doublestar or Stag AR lower in the near future, and later buying an upper, probably from RRA. I'm wondering if the finish of either of the lowers will somewhat match the RRA upper, since they are different manufacturers. For example, I've heard that the DS lowers have a Teflon-like finish. The RRA AR that I current own has more of a matte finish. Not that it has to be a beauty queen, but I'd like the upper and lower to fit and match somewhat. Any opinions on this, based on actual experience? Thanks