Shooting yesterday, and had a few primers (un Crimped) come out and float around in lower. Cleaned one primer from under trigger group. Took rifle to school today and bang. Single shot only....

Found primer material clogged inside gas key. About .6" inside. Can get it out. Is this a known matter or is this a freak deal. Seems like the stars had to align just right to get that aligned and timed perfect.

Thanks