Here's CT's definition of an "assault weapon":
Sec. 53-202a. Assault weapons: Definition.
(a) As used in this section and sections 53-202b to 53-202k, inclusive, “assault weapon” means:
(1) Any selective-fire firearm capable of fully automatic, semiautomatic or burst fire at the option of the user or any of the other following specified semiautomatic firearms:
Algimec Agmi
Armalite AR-180
Australian Automatic Arms SAP Pistol
Auto-Ordnance Thompson type
Avtomat Kalashnikov AK-47 type
Barrett Light-Fifty model 82A1
Beretta AR-70
Bushmaster Auto Rifle and Auto Pistol
Calico models M-900, M-950 and 100-P
Chartered Industries of Singapore SR-88
Colt AR-15 and Sporter
Daewoo K-1, K-2, Max-1 and Max-2
Ecom MK-IV, MP-9 and MP-45
Fabrique Nationale FN/FAL, FN/LAR, or FN/FNC
FAMAS MAS 223
Feather AT-9 and Mini-AT
Federal XC-900 and XC-450
Franchi SPAS-12 and Law-12
Galil AR and ARM
Goncz High-Tech Carbine and High-Tech Long Pistol
Heckler & Koch HK-91, HK-93, HK-94 and SP-89
Holmes MP-83
Intratec TEC-9 and Scorpion
Iver Johnson Enforcer model 3000
MAC-10, MAC-11 and MAC-11 Carbine type
Ruger Mini-14/5F folding stock model only
Scarab Skorpion
SIG 57 AMT and 500 series
Spectre Auto Carbine and Auto Pistol
Springfield Armory BM59, SAR-48 and G-3
Sterline MK-6 and MK-7
Steyr AUG
Street Sweeper and Striker 12 revolving cylinder shotguns
USAS-12
UZI Carbine, Mini-Carbine and Pistol
Weaver Arms Nighthawk
Wilkinson “Linda” Pistol
(2) A part or combination of parts designed or intended to convert a firearm into an assault weapon, as defined in subdivision (1) of this subsection or any combination of parts from which an assault weapon, as defined in subdivision (1) of this subsection, may be rapidly assembled if those parts are in possession or under the control of the same person;
(3) Any semiautomatic firearm not listed in subdivision (1) of this subsection that meets the following criteria:
(A) A semiautomatic rifle that has an ability to accept a detachable magazine and has at lease two of the following:
(i) A folding or telescoping stock;
(ii) A pistol grip that protrudes conspicuously beneath the action of the weapon;
(iii) A bayonet mount;
(iv) A flash suppressor or threaded barrel designed to accommodate a flash suppressor; and
(v) A grenade launcher; or
(B) A semiautomatic pistol that has an ability to accept a detachable magazine and has at least two of the following:
(i) An ammunition magazine that attaches to the pistol outside of the pistol grip;
(ii) A threaded barrel capable of accepting a barrel extender, flash suppressor, forward handgrip or silencer;
(iii) A shroud that is attached to, or partially or completely encircles, the barrel and that permits the shooter to hold the firearm with the non-trigger hand without being burned;
(iv) A manufactured weight of fifty ounces or more when the pistol is unloaded; and
(v) A semiautomatic version of an automatic firearm; or
(C) A semiautomatic shotgun that has at least two of the following:
(i) A folding or telescoping stock;
(ii) A pistol grip that protrudes conspicuously beneath the action of the weapon;
(iii) A fixed magazine capacity in excess of five rounds; and
(iv) An ability to accept a detachable magazine; or
(4) A part or combination of parts designed or intended to convert a firearm into an assault weapon, as defined in subdivision (3) of this subsection, or any combination of parts from which an assault weapon, as defined in subdivision (3) of this subsection, may be rapidly assembled if those parts are in the possession or under the control of the same person.
(b) As used in this section and sections 53-202b to 53-202k, inclusive, the term “assault weapon” does not include any firearm modified to render it permanently inoperable.