Interesting discussion here. I recently received a X-Caliber barrel in .243. When I was installing I noticed it seemed looser than the OEM barrel but didn't think much of it. After getting everything tightened up I mounted the scope and ended up having to crank 6.4 Mils of elevation off center to line it up and thought that seemed bizarre. I shot it yesterday, and while it seemed to shoot ok I was still wondering why I had to adjust the scope so much.

Then I saw this discussion and it made me go pull the barrel off and really start looking at it. While the OD is spot on at 1.055" (the OEM actually comes in at 1.050") the threads are very "sharp" compared to OEM. I tried to take a macro shot of them side by side and have crudely drawn the differences I see between them. I also notice the barrel nut has way more side to side play on the X-Caliber as well.....Sigh, guess I need to get in contact with them as they are making me another barrel right now!

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