Well, after about 2800 rounds, I had my first FTE on Saturday. The good news was that it was just a ID-10-T error. Not a problem with the rifle
I was shooting off some sandbags, holding the magwell with my support hand. Of course, it was only about 15 Degrees F, so I was wearing my thick gloves. I shot one mag through with no issues, the second mag, it went bang-click. I look down at the ejection port to see what's going on, and notice that my support hand thumb is completely blocking the ejection port (I shoot left handed). I don't normally hold the mag well with the support hand on a normal AR for this very reason.
So now my perfect reliability record with the 15-22 is tarnished with one FTF. Even if it was my own fault.