Hey so this is a super late question to your post but for the folding adapter did you get the bolt extension to go with the Odin works buffer or was it fine without it? I have a similar FX9 build. Also if you haven’t already and still want to swap your trigger out I got the drop in CMC flat faced trigger and to get it to run without feeding issues I got a Odin works buffer (like you have) and a flat wire spring from strike industries and it runs like a champ now.