Weird WTF jamb?

[BD1]

I should have mentioned in the original post that I was single loading these using a Bobsled during the match. After the first two jams I tried loading from the magazine with the same result. So it can't be a gas issue, and it doesn't seem like it could be a magazine issue. I'm going to pull it down this afternoon to have a good look at the lugs and chamber and also pull the new spring and try the old spring again to see if that makes a difference.