So recently bought a pretty nice condition diana 66 to go in my giss rifle collection, but.....when the rifle showed up, the barrel is stamped 4.5/.177 as one would expect, but a .177 pellet just fell right through the barrel when I went to load it. What does fit in there perfectly is a .22 pellet, and there is no rifling inside the bore......you read that right, it's now a .22 smoothbore! Please help me understand what reasoning someone would have had to do this? Dart gun for a club maybe? That's the only thing I can think of that makes sense. Or is there a possibility this was done by the factory for some reason? I'm pretty upset, as this was not disclosed when I bought the rifle. Am thinking of returning it, which sucks because I love the rifle otherwise....but if I kept it the odds of me finding a good barrel are about as good as getting struck by lightning I'm thinking any info or opinions on this strange rifle would be greatly appreciated, thanks!