I own one of the above firearms. It is probably 10-15 yrs. old. I purchased it new and have only fired less than 100 rounds through it. I was shooting it this afternoon with some friends and while shooting it the barrel blew off. (Couldn't find the barrel) Has anyone ever heard of this or know anything about this being a problem with this gun? Everything I've read says they are very well built guns. Barrel wasn't blocked, shot five rounds before it happened. Any info would be appreciated.