Any regulation on caliber size? I have a .45 minimax
No restriction as to caliber.
http://en.wikipedia.org/wiki/Gun_laws_in_North_Carolina
Chapel Hill does have an ordinance as to minimum physical size:
http://Sec. 11-134. - Prohibition on display of small handguns.
(a) No person shall display, on any street, sidewalk, alley or other public property any handgun which is easily and ordinarily carried concealed.
(b) For purposes of this article, the term "handgun which is easily and ordinarily carried concealed" shall mean any handgun or other firearm with an overall length of less than six (6) inches; provided, however, that in the case of a handgun or firearm that does not have a handgrip, this term shall mean any such handgun or firearm with an overall length of less than eight (8) inches.
(c) For purposes of this article, the length of a handgun shall be determined as follows:
(1) As the length of a line drawn from the tip of the barrel of the handgun along the length of the barrel to the point where that line intersects with a perpendicular line drawn up from the point on the back of the handgrip farthest from the tip of the barrel; or,
(2) If the length of the handgun measured along the barrel extends back beyond the point where the lines described in (c)(1) above intersect, the length shall be determined by the length of the gun measured straight back from the tip of the barrel for the full length of the gun; or
(3) If the handgun does not have a handgrip, the length shall be determined by measuring the overall length of the weapon by a straight line connecting the tip of the barrel to the point farthest away from the tip of the barrel.
(d) This section shall not apply to persons authorized by state or federal law to carry firearms in the performance of their duties. (Ord. No. 93-11-22/O-1, § 1)
More detail following:
http://www.carolinashootersclub.com...c-open-carry-pistol-size-restrictions.102168/