I own a bunch of S&W rimfires. I picked up a 617-1 last Thurs. Took it to the range and fired 6 rounds, wouldn't extract. Cleaned the already clean chambers and fired 6 more, wouldn't extract.
Left it at the range for their gunsmith to look at, said it probably needs the charging holes reamed based on my prior experience with a 34.
Verdict: The prior owner had dry fired it, and there were tiny ping marks on the mouths of a couple of charging holes ( I had inspected it, but looked for FP marks on the face of the cylinder as I've seen them on other rimfires, not on the edges of the chamfers). He chased the mouths with a reamer, tested it and called it good.
I picked it up ($35) and ran 100 rounds through it without issue. The firing pin hitting the same spot every time was peening the spent cartridges into the small dents from the dryfire and locking the brass into the cylinder.
My 34 would usually give me a couple of cylinders before the cases would stick and I'd need to run a brush through the charging holes, having it reamed to spec solved that issue.