Vegaslaith,unless just recently changed this is the Clark County Code on Pistol Registration:
12.04.110 Registration of pistols within seventy-two hours.
Any resident of the county receiving title to a pistol, whether by purchase, gift, or any other transfer, and whether from a dealer or from any other person, shall, within seventy-two hours of such receipt, personally appear at the county sheriff’s office, together with the pistol, for the purpose of registering the same with the sheriff. It shall be the duty of the sheriff to register the pistol, and he may, and is hereby authorized to cooperate in any manner he sees fit with other law enforcement agencies, and with licensed dealers, relative to registration of pistols, so that efficient registration shall be secured at minimum cost and duplication. (Ord. 3571 § 3, 2007: Ord. 242 § 11, 1965)