sorry it is not legal in CT The following are prohibited:
✘Semi-automatic rifles that are capable of receiving a detachable magazine and has one or
more of the following features:
1. Folding / telescoping stock
2. Pistol grip
3. Bayonet mount
4. Flash suppressor
5. Threaded barrel
6. Grenade launcher
7. Magazine Capacity exceeding
10 rounds budsgunshop.com/feeds/state_reg/connecticut_restrictions.pdf

Albert, no sir it is not CT compliant. The pistol grip kills the deal even if you were to get the stock pinned & unthreaded barrel. budsgunshop.com/feeds/state_reg/connecticut_restrictions.pdf

I would look at Dark and stormy industry's. They specialize in compliant ARs that have fixed magazines (with a fixed mag you can even run a flash suppressor) In stock and full details here dark-storm.com/Connecticut/

Albert, unfortunately no, even with a 10rd Magazine. Restrictions listed under Rifles here : budsgunshop.com/feeds/state_reg/connecticut_restrictions.pdf