This was a one of a kind malf – I had honestly never seen this happen before.
This is one of the Umarex made “Colt” branded .22 LR AR-15 clones. As you can see, a piece of .22 LR brass is jammed crosseyed across the bolt face. The open end of the brass is hooked over the extractor, and the rim of the case is lodged over the top of the bolt. Clearing this malf required prying the case out of the gun with a knife blade before we could even get the gun running again.
I show you this not to bash Colt, whom I’m actually quite fond of, but rather to illustrate a point about .22LRs. They are excellent training platforms for larger guns, especially when they have all the same fire controls. But not all .22s are created equal, and they will at times create malfunctions that are impossible to replicate in a centerfire gun. Choose your rimfire trainer wisely!