"only" may be too excessive but being NR is very significant. Can hunt with it, shoot outside of a range, no hassle of Restricted is huge. XCR sales would plummet if ARs were NR. I for one wouldn't went AR over XCR for the huge price diff.
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Also, saying that non-res status is the "only" thing the XCR has over the AR-15 is a bit flippant. Same could be said for the Ar-180.


















































