There should be zero issues with a plastic stock. He doesn't know if it's "legal" or not because he isn't doing his job. Selling these items required an employee to understand what's what in this regard. IF you have pre-ban that stock is absolutely not an issue. But it's not even an issue at all because it's just a damned stock. So, what you're left with is contacting supervision and getting things straight with them and having them educate the employee. Clear tell them If they won't sell CT residents a stock for damned sakes, then ANY component of ANY AR-15 is banned as well. They might as well write it off for you guys; bgs, uppers, trigger kits, etc., etc. So, pick up the phone and talk to managment and tell them they have it on the shelves already for anyone to buy. Shipping to CT isn't an issue.
Oh my am I happy that I don't have to deal with them anymore.