Also a newbie in the AR build experience, but wondering how your AR break-in experience went? I only managed to fire one round so far due to the cattle and horse roaming the area so I had to shut down the break in for a time. But my first round failed to fire, recharged and it fired just fine. Then the brass stove-piped. My concern is this, when I put on the gas block, pinned of course, and slid the gas block back to the barrel ridge that lines up the holes at the barrel length back from the end of the barrel. Then to center the hole side to side I just did the eyeball thing. So if it was not exactly correctly centered it would cause the rifle to not cycle correctly, right? What method did you use to insure the gas holes were lined up perfectly?