I hate how often the state level background check law conflicts with the federal law, as it leads to frustrations like this (likely on purpose by the wording of the law, but could also be just stupid people writing it).
I have two thoughts on this:
https://www.leg.state.nv.us/NRS/NRS-202.html#NRS202Sec2547
1. In the state law, there is no provision for unresolved background checks. Section 6 states if eligible, dealer gives buyer the gun; if ineligible, dealer does not give the gun. Because there is no provision for unresolved, and the dealer is bound by those two clearly written criteria, dealer can’t do a transfer. Unresolved background checks only apply to straight dealer transfers to unlicensed persons under Federal law.
2. Section 5 states that the owner can remove the firearm from the business while waiting for a background check to complete. But that kind of conflicts with 3. that requires dealers to treat the gun as if it was their own inventory. I’ve yet to to a sale under this law, but I remember reading that some dealers would wait until the background check came back before entering the gun into their books, expressly so they don’t have to background check the original owner for a failed buyer (since it wasn’t on their books).