An SP1 made in 1976 (ish) is absolutely positively 100% legal.
It is obviously pre(94)ban. And it is not named in the new law. ( PA13-3)
So it is legal, as is, with all the evil features that you would ever want. So throw that modern BCM upper on it and carry it uncased in the passenger compartment of your car. Just because you can.
Remember, per the law, this firearm is a rifle. Its not an AW. So no license is needed to possess, transport, or carry it. You can drive down the road with it across your lap and a loaded mag (10 rounds only, phuckers) in your hand and your are legal as long s you don't put the mag in the rifle.
Don
p.s. Text of the relevant portion of the law is below. Please note that for an Colt rifle to be banned by name it must be an AR15 (with no suffix or additional names) or a Sporter, with no suffix or additional names. So a Colt Sporter is banned by name. But a "Target HBar Sporter" is legal. The same goes for an AR15. An AR15 SP1 is legal, an AR15 is not.
The State police have issued a letter stating that all pre-94 guns are legal, even if they are named. However, Attorney Rachel Baird, working for CT Carry has in her analysis determined that that is incorrect and the pre-94-ban exemption only applies to un-named firearms. So its best to avoid the ambiguity. So again, your gun is perfectly legal, because of the SP1 designation, it is not on the named list.
(A) (i) Any selective-fire firearm capable of fully automatic, semiautomatic or burst fire at the option of the user or any of the 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; Encom 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; MAC-10, MAC-11 and MAC-11 Carbine type; Intratec TEC-9 and Scorpion; Iver Johnson Enforcer model 3000; 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; Sterling 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;
Link to PA13-3 in all its glory:
https://www.cga.ct.gov/2013/TOB/S/2013SB-01160-R00-SB.htm
