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9C has a tri-lug barrel and the 9CT has a tri lug with a threaded barrel with 1/2×28 threads. So 9CT is threaded while 9C is not. I hope this helps!

Anthony, the 9CT has a Threaded Barred with a thread pitch of 1/2×28 while the 9C in non threaded. Cheers and stay safe!

Anthony, the 9CT has a threaded barrel. Have a great day!