I wish they'd had the internet back when I had a Rossi revolver. I would have sold it to one of you guys, instead of throwing it in a lake...
Mine was an M69 (IIRC). Blued, 5-shot snub, wood grips. Bought it at an Estate Sale back in 1983 or so. Looked like it had never been shot. Don't recall what I gave for it, but it didn't seem like that much. Of course, everything was a bunch cheaper back then.
Okay, when I took it to the range, I could fire one shot, and under recoil the cylinder would un-latch and open about 1/8 inch. Not enough to be obvious, but just enough that when I attempted to move the trigger again...nothing. I figured it out quickly, slapped the cylinder closed, and squeezed off another round. same thing. And again.
I took it home, cleaned it (again), verified that the thumb latch was not sticking. The ejector rod was not bent or sticking, and was square at the rear end. I fiddled around, tried it again, same thing.
Took it to a gunsmith who advised me not to waste my money on crap. Basically said it would cost more to fix it than it was worth. I took his word on that, although that experience soured me on revolvers for the next 20 years.
I found a 4" S&W M-66 on GB for something absurd, like $250, in 2004. Bought it, and since then I have bought and sold a bunch of used S&Ws. None of them have given me the first moment's trouble.
Long story short, I hope your experience is different (better) than mine, but I know where I'm spending my money.