So I got a new BCM Recce 16". Yesterday at the range, after about 200 or so perfect rounds, the rifle started short stroking, i.e. empty casings not fully ejecting and getting dislodged in various ways. The short stroking issue happened about 5 times, almost in a row.
I field stripped the rifle and did not notice anything off. I put it back together and fired about 50 rounds without a problem.
When I got home, I inspected it closer and noticed the bolt had only two gas rings. I also noticed I could move the extractor with my thumb. There was good tension, but I could move it with my thumb if I applied a decent amount of pressure. I took off the extractor fairly easily and noticed there was no rubber oring that you typically see. I added one and it the extractor back in the bolt. The tension on it with the oring was much stronger, practically unmovable by hand.
I have not shot it again yet and I emailed BCM yesterday. Was just wondering if anyone has any ideas. My guess is the lack of the third gas ring caused a small gas leak, perhaps due to the two gas rings overlapping their gaps, and that's when the short stroking happened.
All ammo was 5.56 M193, PMC Xtac, American Eagle, and Independence. Rifle was sufficiently lubed up.