What more are you looking for info-wise on the barrel nut? When putting it on, it didn’t line up for the tube. He threw additional weight at it to to get it to align and snapped his barrel nut wrench. The. Went to plan B and sacrificed it during removal. He’ll have to chime in so you can be sure, but from the sound of the posts, no - he has not fired it - manual operation only. I’m curious where you’re going, because I know you have something specific you’re looking at with this...what is it you want to know about the barrel nut?