The chamber on this one is good. I couldn't really comment on any other, but I would guess this one is typical.
One thing I will say as I am currently post-birthday-celebration (not mine): I finally - having worked on Jeff for a year, and after carefully protecting every piece of information he asked me not to reveal - found out who makes their barrels. Obviously I can't reveal that but...yeah. I mean...yeah, I would buy an NEA barrel. Knowing what it is, I would encourage anyone who wants a barrel to consider an NEA. Note that for months and months and months I have not been telling anyone to buy NEA anything. I don't specifically recommend the gun, although so far mine seems like it will do well. I do, however, specifically advise people to seek out an NEA barrel. I know what it is and it is not what I would have guessed at all, and now that I know I would definitely, definitely try to track one down for any DMR project I was going to take on.
Tomorrow I will have a look at the actual diameter of the barrel and see if I can get some more information on it for you.
******please do not PM me to ask who is supplying the blanks. Obviously that would be an extremely unethical thing for me to say, and, I imagine, a direct violation of our NDA.