Most firearm jams are pretty much the same. Failure to eject. Failure to feed. Double feed. Light strike on the primer. These firearm jams are a dime a dozen.
This on the other hand, this is probably the most unique jam I’ve ever seen.
A bee flew into the chamber during the exact split second the AR-15’s action was cycling. This unfortunate insect was instantly squashed by the BCG, making the rifle inoperable. One in a billion doesn’t even come close to describing it.