^ Semantics or terminology difference I would say. *shrug*
While RRA would qualify as a production house, in a very loose sense, they are not turning out their NM rifles at the rate & in the configurations that they are moving their standard rifles. Hell, from their website you can order a 16" complete .223 rifle for $640 ( less lower receiver ) and need no FFL to have it shipped to you. I would say that a lower receiver will NEVER cost you the difference of the $275 to get to the price you paid. I would submit that would be the same difference in buying, say, a Kimber model from their Pro Shop as opposed to their standard production line model. In that advent, no manufacturer is going to offer a guarantee on a weapon that doesn't go through some sort of "higher standard" - be it tighter tolerances, hand fit parts, custom ( upgraded ) parts, or a just plain hand inspection to insure that you are providing a product that meets the advertising.
I agree that RRA is a production house and they do turn out a fine product, I just consider an AR rifle that MSRP's for over a grand to be a bit above the average price & care production run of their products. Getting it for $915 was a god d@mn steal, so HEAVY KUDOS
to you for nailing down that price. Well played sir, well played.
The weapon is none the less a fine piece of kit and I would have no problem fielding one of their products should a SHTF situation occur and one was at hand.