No loophole here in CT . First all pistol transfers are regulated. Longarms between private parties are not. No paper work ,nothing.
Unless you are at a gunshow.
Sec. 29-37g. Gun show requirements. (a) For the purposes of this section, (1) "gun show" means any event (A) at which fifty or more firearms are offered or exhibited for sale, transfer or exchange to the public and (B) at which two or more persons are exhibiting one or more firearms for sale, transfer or exchange to the public; and (2) "gun show promoter" means any person who organizes, plans, promotes or operates a gun show.
(b) Not later than thirty days before commencement of a gun show, the gun show promoter shall notify the chief of police or, where there is no chief of police, the warden of the borough or the first selectman of the town in which the gun show is to take place of the date, time, duration and location of the gun show.
(c) No person, firm or corporation shall sell, deliver or otherwise transfer a firearm at a gun show until such person, firm or corporation has complied with the provisions of section 29-36l.
Now 29-36l.....
Sec. 29-36l. Verification of eligibility of persons to receive or possess firearms. State database. Instant criminal background check. Immunity of seller or transferor. Authorization number required. (a) The Commissioner of Public Safety shall establish a state database within one year of October 1, 1994, that any person, firm or corporation who sells or otherwise transfers pistols or revolvers may access, by telephone or other electronic means in addition to the telephone, for information to be supplied immediately, on whether a permit to carry a pistol or revolver, issued pursuant to subsection (b) of section 29-28, a permit to sell at retail a pistol or revolver, issued pursuant to subsection (a) of section 29-28, or an eligibility certificate for a pistol or revolver, issued pursuant to section 29-36f, is valid and has not been revoked or suspended.
(b) Upon establishment of the database, the commissioner shall notify each person, firm or corporation holding a permit to sell at retail pistols or revolvers issued pursuant to subsection (a) of section 29-28 of the existence and purpose of the system and the means to be used to access the database.
(c) The Department of Public Safety shall establish days and hours during which the telephone number or other electronic means shall be operational for purposes of responding to inquiries, taking into consideration the normal business hours of retail firearm businesses.
(d) The Department of Public Safety shall be the point of contact for initiating a background check through the National Instant Criminal Background Check System (NICS), established under section 103 of the Brady Handgun Violence Prevention Act, on individuals purchasing firearms.
(e) Any person, firm or corporation that contacts the Department of Public Safety to access the database established under this section and determine if a person is eligible to receive or possess a firearm shall not be held civilly liable for the sale or transfer of a firearm to a person whose receipt or possession of such firearm is unlawful or for refusing to sell or transfer a firearm to a person who may lawfully receive or possess such firearm if such person, firm or corporation relied, in good faith, on the information provided to such person, firm or corporation by said department, unless the conduct of such person, firm or corporation was unreasonable or reckless.
(f) Any person, firm or corporation that sells, delivers or otherwise transfers any firearm pursuant to section 29-33 or 29-37a, shall contact the Department of Public Safety to access the database established under this section and receive an authorization number for such sale, delivery or transfer. The provisions of this subsection shall not apply to: (1) Any sale, delivery or transfer of an antique firearm manufactured in or before 1898, including any firearm with a matchlock, flintlock, percussion cap or similar type of ignition system manufactured in or before 1898; (2) any sale, delivery or transfer of any replica of any firearm described in subdivision (1) of this subsection if such replica uses rimfire or conventional centerfire fixed ammunition which is no longer manufactured in the United States and which is not readily available in the ordinary channels of commercial trade; (3) transactions between persons who are licensed as firearms importers or collectors, manufacturers or dealers pursuant to 18 USC 921 et seq.; (4) the transfer of firearms to and from gunsmiths for purposes of repair only; and (5) any sale, delivery or transfer of any firearm to any agency of the United States, the state of Connecticut or any local government.
Sorry for the long post...but the "gunshow loophole" has been long closed here. Hopefully it doesn't spread to the free parts of the country.