Hi james, never had an OOB with the 15-22, but I had a few with my CZ V-22 upper, until I polished out the chamber. Not to make light of it, but they usually don't amount to much with the .22lr. Not a MAJOR saftey issue IMHO.
Just makes a little louder bang and you'll see some smoke coming out of the reciever. Having said that, my grandkids love to shoot my .22s and they all know that safety glasses and earplugs are required at Granpa's range!
Mine eats the Federal #750 bulk pack 36gr hp like candy. It also likes the more pricey CCI Mini Mags. They sure are a fun little rifle.