The reason brands like Colt, DD, LMT, BCM, Spikes, Noveske etc are "better" is a subjective thing. What they do is up the ante with QC by adhering to or exceeding the requirements set out by the US govt for testing the quality of their bolts and barrels. Their guns are made to not fail you in a life or death situation. They are made for combat basically. Most of the other manufacturers use generic, batch tested parts. Serious end users tend to consider them hobby guns at best and junk at worst. That's basically what you are paying for with the above mentioned brands - the wank factor of owning a "tier 1 AR". I'm not immune, I traded a complete rifle for a Colt upper. Just cuz.
In saying that "low tier" brands like RRA are fine for hunting and pretty much everything else a normal Kiwi would do. I have had a RRA for a year and been very happy with it.
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