I have a 12" i'm trying to get rid of, had it on the EE for a few months with no takers.
Clyde Armory is were I got my first one, they messed up and sent me the Delta mount instead of a rail mount... fixed it without issue, my 2nd was a factory DD not Title 1, bought through KGI. I DO NOT RECOMMEND THEM, their form 3 to my dealer was kicked back and it sat that way for 6 months because they were poor with paperwork and communication. The Form 3 had to be resubmitted 6 months after no movement before I could even think about the Form 4, (Form 4 was sitting at my dealers without a signature date just waiting for the Form 3 to go through, I had assumed things were moving along for 6 months, good thing I checked
It took me around 2 years of waiting from the time I paid for it to when I picked it up.
ETA- there is a rail mount title 1 receiver on the EE for $1700 (not mine)